base.bbclass: Fix up disclean and clean up its exception handling
base.bbclass: Fix up disclean and clean up its exception handling

My python is rusty :)

nlebedenco/mini2440,sampov2/audio-openembedded,dave-billin/overo-ui-moos-auv,hulifox008/openembedded,yyli/overo-oe,KDAB/OpenEmbedded-Archos,bticino/openembedded,dellysunnymtech/sakoman-oe,openembedded/openembedded,SIFTeam/openembedded,openembedded/openembedded,demsey/openenigma2,openembedded/openembedded,xifengchuo/openembedded,openpli-arm/openembedded,SIFTeam/openembedded,sledz/oe,sentient-energy/emsw-oe-mirror,Martix/Eonos,troth/oe-ts7xxx,libo/openembedded,demsey/openenigma2,trini/openembedded,YtvwlD/od-oe,rascalmicro/openembedded-rascal,thebohemian/openembedded,sentient-energy/emsw-oe-mirror,nx111/openembeded_openpli2.1_nx111,anguslees/openembedded-android,BlackPole/bp-openembedded,crystalfontz/openembedded,trini/openembedded,giobauermeister/openembedded,anguslees/openembedded-android,SIFTeam/openembedded,dave-billin/overo-ui-moos-auv,Martix/Eonos,demsey/openembedded,dellysunnymtech/sakoman-oe,xifengchuo/openembedded,nlebedenco/mini2440,bticino/openembedded,hulifox008/openembedded,dave-billin/overo-ui-moos-auv,openpli-arm/openembedded,nx111/openembeded_openpli2.1_nx111,John-NY/overo-oe,trini/openembedded,nlebedenco/mini2440,YtvwlD/od-oe,philb/pbcl-oe-2010,nvl1109/openembeded,John-NY/overo-oe,Martix/Eonos,JamesAng/goe,YtvwlD/od-oe,libo/openembedded,anguslees/openembedded-android,thebohemian/openembedded,scottellis/overo-oe,openpli-arm/openembedded,Martix/Eonos,sentient-energy/emsw-oe-mirror,anguslees/openembedded-android,SIFTeam/openembedded,sampov2/audio-openembedded,thebohemian/openembedded,scottellis/overo-oe,JrCs/opendreambox,nvl1109/openembeded,SIFTeam/openembedded,sentient-energy/emsw-oe-mirror,sutajiokousagi/openembedded,bticino/openembedded,libo/openembedded,JrCs/opendreambox,sampov2/audio-openembedded,JrCs/opendreambox,mrchapp/arago-oe-dev,troth/oe-ts7xxx,SIFTeam/openembedded,mrchapp/arago-oe-dev,sampov2/audio-openembedded,demsey/openembedded,JamesAng/goe,hulifox008/openembedded,yyli/overo-oe,popazerty/openembedded-cuberevo,crystalfontz/openembedded,xifengchuo/openembedded,nlebedenco/mini2440,sampov2/audio-openembedded,nlebedenco/mini2440,philb/pbcl-oe-2010,buglabs/oe-buglabs,openpli-arm/openembedded,dellysunnymtech/sakoman-oe,troth/oe-ts7xxx,bticino/openembedded,dellysunnymtech/sakoman-oe,JamesAng/goe,popazerty/openembedded-cuberevo,libo/openembedded,openembedded/openembedded,YtvwlD/od-oe,JamesAng/oe,sledz/oe,JrCs/opendreambox,YtvwlD/od-oe,yyli/overo-oe,popazerty/openembedded-cuberevo,openpli-arm/openembedded,buglabs/oe-buglabs,nvl1109/openembeded,sutajiokousagi/openembedded,John-NY/overo-oe,dellysunnymtech/sakoman-oe,nvl1109/openembeded,thebohemian/openembedded,BlackPole/bp-openembedded,mrchapp/arago-oe-dev,dave-billin/overo-ui-moos-auv,yyli/overo-oe,nzjrs/overo-openembedded,openpli-arm/openembedded,giobauermeister/openembedded,xifengchuo/openembedded,JamesAng/oe,giobauermeister/openembedded,scottellis/overo-oe,philb/pbcl-oe-2010,demsey/openenigma2,demsey/openembedded,KDAB/OpenEmbedded-Archos,openembedded/openembedded,sledz/oe,rascalmicro/openembedded-rascal,philb/pbcl-oe-2010,hulifox008/openembedded,xifengchuo/openembedded,trini/openembedded,sentient-energy/emsw-oe-mirror,yyli/overo-oe,nzjrs/overo-openembedded,crystalfontz/openembedded,openembedded/openembedded,SIFTeam/openembedded,sampov2/audio-openembedded,buglabs/oe-buglabs,philb/pbcl-oe-2010,BlackPole/bp-openembedded,buglabs/oe-buglabs,dave-billin/overo-ui-moos-auv,John-NY/overo-oe,YtvwlD/od-oe,JrCs/opendreambox,JamesAng/oe,mrchapp/arago-oe-dev,bticino/openembedded,philb/pbcl-oe-2010,xifengchuo/openembedded,dellysunnymtech/sakoman-oe,buglabs/oe-buglabs,nvl1109/openembeded,demsey/openembedded,JamesAng/oe,YtvwlD/od-oe,nlebedenco/mini2440,nx111/openembeded_openpli2.1_nx111,openpli-arm/openembedded,xifengchuo/openembedded,nvl1109/openembeded,crystalfontz/openembedded,rascalmicro/openembedded-rascal,thebohemian/openembedded,JamesAng/oe,demsey/openenigma2,scottellis/overo-oe,sutajiokousagi/openembedded,openembedded/openembedded,troth/oe-ts7xxx,JrCs/opendreambox,bticino/openembedded,JrCs/opendreambox,trini/openembedded,troth/oe-ts7xxx,demsey/openenigma2,giobauermeister/openembedded,bticino/openembedded,anguslees/openembedded-android,sledz/oe,sutajiokousagi/openembedded,nx111/openembeded_openpli2.1_nx111,Martix/Eonos,demsey/openenigma2,giobauermeister/openembedded,KDAB/OpenEmbedded-Archos,thebohemian/openembedded,rascalmicro/openembedded-rascal,scottellis/overo-oe,crystalfontz/openembedded,JamesAng/goe,nx111/openembeded_openpli2.1_nx111,mrchapp/arago-oe-dev,troth/oe-ts7xxx,BlackPole/bp-openembedded,buglabs/oe-buglabs,rascalmicro/openembedded-rascal,philb/pbcl-oe-2010,John-NY/overo-oe,KDAB/OpenEmbedded-Archos,demsey/openembedded,dellysunnymtech/sakoman-oe,nzjrs/overo-openembedded,crystalfontz/openembedded,libo/openembedded,popazerty/openembedded-cuberevo,openembedded/openembedded,dave-billin/overo-ui-moos-auv,popazerty/openembedded-cuberevo,sentient-energy/emsw-oe-mirror,dellysunnymtech/sakoman-oe,John-NY/overo-oe,giobauermeister/openembedded,popazerty/openembedded-cuberevo,sledz/oe,sentient-energy/emsw-oe-mirror,hulifox008/openembedded,yyli/overo-oe,BlackPole/bp-openembedded,giobauermeister/openembedded,trini/openembedded,mrchapp/arago-oe-dev,nzjrs/overo-openembedded,anguslees/openembedded-android,mrchapp/arago-oe-dev,nzjrs/overo-openembedded,troth/oe-ts7xxx,xifengchuo/openembedded,popazerty/openembedded-cuberevo,BlackPole/bp-openembedded,rascalmicro/openembedded-rascal,hulifox008/openembedded,JamesAng/oe,libo/openembedded,JamesAng/goe,JamesAng/goe,nx111/openembeded_openpli2.1_nx111,dave-billin/overo-ui-moos-auv,thebohemian/openembedded,JamesAng/goe,buglabs/oe-buglabs,giobauermeister/openembedded,John-NY/overo-oe,nzjrs/overo-openembedded,rascalmicro/openembedded-rascal,nx111/openembeded_openpli2.1_nx111,hulifox008/openembedded,sledz/oe,JrCs/opendreambox,openembedded/openembedded,crystalfontz/openembedded,JamesAng/oe,sutajiokousagi/openembedded,yyli/overo-oe,libo/openembedded,nvl1109/openembeded,demsey/openenigma2,demsey/openembedded,trini/openembedded,scottellis/overo-oe,openembedded/openembedded,xifengchuo/openembedded,nlebedenco/mini2440,KDAB/OpenEmbedded-Archos,buglabs/oe-buglabs,sampov2/audio-openembedded,rascalmicro/openembedded-rascal,demsey/openembedded,KDAB/OpenEmbedded-Archos,sutajiokousagi/openembedded,scottellis/overo-oe,giobauermeister/openembedded,popazerty/openembedded-cuberevo,nzjrs/overo-openembedded,JrCs/opendreambox,KDAB/OpenEmbedded-Archos,Martix/Eonos,nx111/openembeded_openpli2.1_nx111,openembedded/openembedded,dellysunnymtech/sakoman-oe,YtvwlD/od-oe,BlackPole/bp-openembedded,sutajiokousagi/openembedded,sledz/oe,yyli/overo-oe,anguslees/openembedded-android,Martix/Eonos