Remove invalid powershell variable
Remove invalid powershell variable

This wasn't previously flagged because this only comes into play if there is an error.  As
written the code will display "$echo isn't a variable" instaed of the actual error.

Hosch250/roslyn,bkoelman/roslyn,jmarolf/roslyn,aelij/roslyn,jkotas/roslyn,KevinRansom/roslyn,kelltrick/roslyn,jcouv/roslyn,akrisiun/roslyn,kelltrick/roslyn,tvand7093/roslyn,tannergooding/roslyn,OmarTawfik/roslyn,lorcanmooney/roslyn,CaptainHayashi/roslyn,MichalStrehovsky/roslyn,MattWindsor91/roslyn,jasonmalinowski/roslyn,panopticoncentral/roslyn,gafter/roslyn,tmeschter/roslyn,mgoertz-msft/roslyn,lorcanmooney/roslyn,weltkante/roslyn,MattWindsor91/roslyn,dpoeschl/roslyn,tmat/roslyn,brettfo/roslyn,TyOverby/roslyn,yeaicc/roslyn,Giftednewt/roslyn,jeffanders/roslyn,bkoelman/roslyn,stephentoub/roslyn,xasx/roslyn,sharwell/roslyn,mavasani/roslyn,AnthonyDGreen/roslyn,tmeschter/roslyn,jasonmalinowski/roslyn,agocke/roslyn,swaroop-sridhar/roslyn,akrisiun/roslyn,DustinCampbell/roslyn,diryboy/roslyn,AdamSpeight2008/roslyn-AdamSpeight2008,dotnet/roslyn,jamesqo/roslyn,swaroop-sridhar/roslyn,shyamnamboodiripad/roslyn,nguerrera/roslyn,panopticoncentral/roslyn,nguerrera/roslyn,mmitche/roslyn,mgoertz-msft/roslyn,davkean/roslyn,wvdd007/roslyn,sharwell/roslyn,dotnet/roslyn,KevinRansom/roslyn,eriawan/roslyn,mattscheffer/roslyn,heejaechang/roslyn,MichalStrehovsky/roslyn,mattwar/roslyn,dpoeschl/roslyn,tmat/roslyn,AmadeusW/roslyn,mattwar/roslyn,mattwar/roslyn,Hosch250/roslyn,DustinCampbell/roslyn,aelij/roslyn,shyamnamboodiripad/roslyn,kelltrick/roslyn,xasx/roslyn,cston/roslyn,xasx/roslyn,robinsedlaczek/roslyn,jmarolf/roslyn,VSadov/roslyn,stephentoub/roslyn,OmarTawfik/roslyn,KirillOsenkov/roslyn,ErikSchierboom/roslyn,weltkante/roslyn,jamesqo/roslyn,CyrusNajmabadi/roslyn,wvdd007/roslyn,jkotas/roslyn,TyOverby/roslyn,physhi/roslyn,jcouv/roslyn,AlekseyTs/roslyn,genlu/roslyn,drognanar/roslyn,VSadov/roslyn,AdamSpeight2008/roslyn-AdamSpeight2008,drognanar/roslyn,stephentoub/roslyn,reaction1989/roslyn,CaptainHayashi/roslyn,akrisiun/roslyn,srivatsn/roslyn,abock/roslyn,paulvanbrenk/roslyn,Hosch250/roslyn,tvand7093/roslyn,wvdd007/roslyn,mmitche/roslyn,jeffanders/roslyn,physhi/roslyn,davkean/roslyn,genlu/roslyn,mattscheffer/roslyn,CyrusNajmabadi/roslyn,AlekseyTs/roslyn,orthoxerox/roslyn,TyOverby/roslyn,AdamSpeight2008/roslyn-AdamSpeight2008,jamesqo/roslyn,orthoxerox/roslyn,cston/roslyn,genlu/roslyn,tvand7093/roslyn,AlekseyTs/roslyn,KirillOsenkov/roslyn,gafter/roslyn,AnthonyDGreen/roslyn,heejaechang/roslyn,jcouv/roslyn,dpoeschl/roslyn,mgoertz-msft/roslyn,paulvanbrenk/roslyn,pdelvo/roslyn,tannergooding/roslyn,khyperia/roslyn,weltkante/roslyn,jasonmalinowski/roslyn,panopticoncentral/roslyn,tmat/roslyn,MattWindsor91/roslyn,brettfo/roslyn,MichalStrehovsky/roslyn,bartdesmet/roslyn,bartdesmet/roslyn,mmitche/roslyn,ErikSchierboom/roslyn,Giftednewt/roslyn,robinsedlaczek/roslyn,jeffanders/roslyn,srivatsn/roslyn,mavasani/roslyn,AmadeusW/roslyn,khyperia/roslyn,mattscheffer/roslyn,robinsedlaczek/roslyn,DustinCampbell/roslyn,davkean/roslyn,dotnet/roslyn,AmadeusW/roslyn,AnthonyDGreen/roslyn,amcasey/roslyn,jmarolf/roslyn,bartdesmet/roslyn,bkoelman/roslyn,eriawan/roslyn,CaptainHayashi/roslyn,mavasani/roslyn,cston/roslyn,diryboy/roslyn,pdelvo/roslyn,srivatsn/roslyn,yeaicc/roslyn,ErikSchierboom/roslyn,VSadov/roslyn,nguerrera/roslyn,lorcanmooney/roslyn,abock/roslyn,MattWindsor91/roslyn,khyperia/roslyn,Giftednewt/roslyn,diryboy/roslyn,tannergooding/roslyn,heejaechang/roslyn,amcasey/roslyn,yeaicc/roslyn,pdelvo/roslyn,sharwell/roslyn,aelij/roslyn,reaction1989/roslyn,drognanar/roslyn,paulvanbrenk/roslyn,swaroop-sridhar/roslyn,OmarTawfik/roslyn,reaction1989/roslyn,gafter/roslyn,brettfo/roslyn,amcasey/roslyn,orthoxerox/roslyn,agocke/roslyn,KirillOsenkov/roslyn,jkotas/roslyn,shyamnamboodiripad/roslyn,tmeschter/roslyn,physhi/roslyn,KevinRansom/roslyn,CyrusNajmabadi/roslyn,abock/roslyn,agocke/roslyn,eriawan/roslyn