Makefile generator: minor bug where we wrote an empty rule.
Makefile generator: minor bug where we wrote an empty rule.

git-svn-id: e7e1075985beda50ea81ac4472467b4f6e91fc78@440 78cadc50-ecff-11dd-a971-7dbc132099af

android-ia/platform_external_chromium_org_tools_gyp,lukeweber/gyp-override,azunite/gyp_20150930,svn2github/gyp,bpsinc-native/src_tools_gyp,Jack-Q/GYP-copy,AWhetter/gyp,bpsinc-native/src_tools_gyp,xin3liang/platform_external_chromium_org_tools_gyp,bnq4ever/gypgoogle,channing/gyp,geekboxzone/lollipop_external_chromium_org_tools_gyp,android-ia/platform_external_chromium_org_tools_gyp,yinquan529/platform-external-chromium_org-tools-gyp,turbulenz/gyp,cysp/gyp,bdarnell/gyp,openpeer/webrtc-gyp,Omegaphora/external_chromium_org_tools_gyp,mapbox/gyp,amoikevin/gyp,Jack-Q/GYP-copy,bnq4ever/gypgoogle,lukeweber/gyp-override,mistydemeo/gyp,lukeweber/gyp-override,sport-monkey/GYP,mkrautz/gyp-libmumble,chromium/gyp,cysp/gyp,cysp/gyp,sport-monkey/GYP,azunite/gyp,clar/gyp,pandaxcl/gyp,lukeweber/gyp-override,Danath/gyp,cchamberlain/gyp,AOSPU/external_chromium_org_tools_gyp,xin3liang/platform_external_chromium_org_tools_gyp,AWhetter/gyp,tarc/gyp,kevinchen3315/gyp-git,sdklite/gyp,msc-/gyp,ttyangf/pdfium_gyp,omasanori/gyp,MIPS/external-chromium_org-tools-gyp,sloanyang/gyp,mumble-voip/libmumble-gyp,sanyaade-teachings/gyp,mistydemeo/gyp,IllusionRom-deprecated/android_platform_external_chromium_org_tools_gyp,android-ia/platform_external_chromium_org_tools_gyp,AOSPU/external_chromium_org_tools_gyp,svn2github/gyp,pyokagan/gyp,cchamberlain/gyp,mapbox/gyp,clar/gyp,saghul/gyn,sanyaade-teachings/gyp,adblockplus/gyp,LazyCodingCat/gyp,sdklite/gyp,adblockplus/gyp,tarc/gyp,amoikevin/gyp,sdklite/gyp,ttyangf/pdfium_gyp,carlTLR/gyp,svn2github/kgyp,trafi/gyp,Jack-Q/GYP-copy,pyokagan/gyp,springmeyer/gyp,AWhetter/gyp,sfiera/gyp,yangrongwei/gyp,amoikevin/gyp,mgamer/gyp,adblockplus/gyp,tarc/gyp,azunite/gyp_20150930,bpsinc-native/src_tools_gyp,android-ia/platform_external_chromium_org_tools_gyp,pyokagan/gyp,enkripsi/gyp,mkrautz/gyp-libmumble,dougbeal/gyp,yangrongwei/gyp,IllusionRom-deprecated/android_platform_external_chromium_org_tools_gyp,luvit/gyp,ryfx/gyp,bnq4ever/gypgoogle,mapbox/gyp,azunite/gyp,Jack-Q/GYP-copy,xin3liang/platform_external_chromium_org_tools_gyp,mkrautz/gyp-libmumble,bdarnell/gyp,turbulenz/gyp,alexcrichton/gyp,bnoordhuis/gyp,saghul/gyn,cchamberlain/gyp,sanyaade-teachings/gyp,tarc/gyp,bnoordhuis/gyp,brson/gyp,Phuehvk/gyp,AOSPU/external_chromium_org_tools_gyp,svn2github/gyp,carlTLR/gyp,mumble-voip/libmumble-gyp,pandaxcl/gyp,amoikevin/gyp,enkripsi/gyp,mapbox/gyp,Danath/gyp,LazyCodingCat/gyp,mgamer/gyp,sdklite/gyp,azunite/gyp,svn2github/gyp,cysp/gyp,bnoordhuis/gyp,pyokagan/gyp,erikge/watch_gyp,openpeer/webrtc-gyp,trafi/gyp,Danath/gyp,okumura/gyp,sfiera/gyp,ttyangf/gyp,mistydemeo/gyp,yjhjstz/gyp,dougbeal/gyp,dougbeal/gyp,sloanyang/gyp,ttyangf/gyp,azunite/gyp_20150930,duanhjlt/gyp,msc-/gyp,IllusionRom-deprecated/android_platform_external_chromium_org_tools_gyp,duanhjlt/gyp,okwasi/gyp,yangrongwei/gyp,sport-monkey/GYP,pyokagan/gyp,ryfx/gyp,saghul/gyn,erikge/watch_gyp,bulldy80/gyp_unofficial,clar/gyp,yjhjstz/gyp,ttyangf/gyp,sport-monkey/GYP,xin3liang/platform_external_chromium_org_tools_gyp,MIPS/external-chromium_org-tools-gyp,alexcrichton/gyp,ttyangf/gyp,turbulenz/gyp,okwasi/gyp,sfiera/gyp,trafi/gyp,Chilledheart/gyp,Omegaphora/external_chromium_org_tools_gyp,clar/gyp,Phuehvk/gyp,openpeer/webrtc-gyp,omasanori/gyp,azunite/gyp_20150930,lianliuwei/gyp,geekboxzone/lollipop_external_chromium_org_tools_gyp,bdarnell/gyp,yinquan529/platform-external-chromium_org-tools-gyp,cysp/gyp,IllusionRom-deprecated/android_platform_external_chromium_org_tools_gyp,Danath/gyp,mgamer/gyp,Chilledheart/gyp,duanhjlt/gyp,bpsinc-native/src_tools_gyp,Phuehvk/gyp,svn2github/kgyp,svn2github/kgyp,brson/gyp,okumura/gyp,svn2github/gyp,yjhjstz/gyp,pandaxcl/gyp,geekboxzone/lollipop_external_chromium_org_tools_gyp,mistydemeo/gyp,azunite/gyp_20150930,enkripsi/gyp,duanhjlt/gyp,enkripsi/gyp,channing/gyp,dougbeal/gyp,chromium/gyp,yangrongwei/gyp,dougbeal/gyp,omasanori/gyp,ryfx/gyp,sdklite/gyp,ryfx/gyp,azunite/gyp,lianliuwei/gyp,luvit/gyp,kevinchen3315/gyp-git,trafi/gyp,tarc/gyp,msc-/gyp,yjhjstz/gyp,bulldy80/gyp_unofficial,Chilledheart/gyp,mumble-voip/libmumble-gyp,ttyangf/pdfium_gyp,okwasi/gyp,bnoordhuis/gyp,alexcrichton/gyp,alexcrichton/gyp,Chilledheart/gyp,Omegaphora/external_chromium_org_tools_gyp,mgamer/gyp,amoikevin/gyp,ttyangf/gyp,clar/gyp,openpeer/webrtc-gyp,luvit/gyp,bdarnell/gyp,okumura/gyp,svn2github/kgyp,pandaxcl/gyp,bulldy80/gyp_unofficial,adblockplus/gyp,springmeyer/gyp,saghul/gyn,turbulenz/gyp,bulldy80/gyp_unofficial,lianliuwei/gyp,lianliuwei/gyp,channing/gyp,openpeer/webrtc-gyp,msc-/gyp,bnoordhuis/gyp,azunite/gyp,LazyCodingCat/gyp,sloanyang/gyp,mumble-voip/libmumble-gyp,omasanori/gyp,kevinchen3315/gyp-git,duanhjlt/gyp,saghul/gyn,ttyangf/pdfium_gyp,pandaxcl/gyp,Omegaphora/external_chromium_org_tools_gyp,erikge/watch_gyp,sanyaade-teachings/gyp,okumura/gyp,AWhetter/gyp,Chilledheart/gyp,msc-/gyp,chromium/gyp,bulldy80/gyp_unofficial,brson/gyp,AWhetter/gyp,carlTLR/gyp,Phuehvk/gyp,carlTLR/gyp,kevinchen3315/gyp-git,mgamer/gyp,mkrautz/gyp-libmumble,enkripsi/gyp,bnq4ever/gypgoogle,adblockplus/gyp,turbulenz/gyp,springmeyer/gyp,Jack-Q/GYP-copy,ttyangf/pdfium_gyp,luvit/gyp,LazyCodingCat/gyp,sport-monkey/GYP,yjhjstz/gyp,springmeyer/gyp,mapbox/gyp,erikge/watch_gyp,cchamberlain/gyp,chromium/gyp,sloanyang/gyp,channing/gyp,MIPS/external-chromium_org-tools-gyp,AOSPU/external_chromium_org_tools_gyp,yinquan529/platform-external-chromium_org-tools-gyp,carlTLR/gyp,yinquan529/platform-external-chromium_org-tools-gyp,MIPS/external-chromium_org-tools-gyp,Danath/gyp,springmeyer/gyp,erikge/watch_gyp,sanyaade-teachings/gyp,trafi/gyp,LazyCodingCat/gyp,cchamberlain/gyp,geekboxzone/lollipop_external_chromium_org_tools_gyp,bnq4ever/gypgoogle,svn2github/kgyp,chromium/gyp,ryfx/gyp,okwasi/gyp,Phuehvk/gyp,brson/gyp