Do not process a cell if curly braces are not balanced
Do not process a cell if curly braces are not balanced

at the root prompt, one can type code on multiple lines, for example in presence
of open scopes.
In a notebook this behaviour is not well defined: each cell is somehow self
contained. This commit enforces all cells to be self contained, checking the
error code of TInterpreter::ProcessLine, which is TInterpreter::kProcessing
when the closing curly braces do not equal the opened ones.

mhuwiler/rootauto,simonpf/root,mkret2/root,gganis/root,Y--/root,BerserkerTroll/root,root-mirror/root,krafczyk/root,olifre/root,georgtroska/root,sawenzel/root,buuck/root,sawenzel/root,beniz/root,mkret2/root,karies/root,zzxuanyuan/root,abhinavmoudgil95/root,sawenzel/root,gbitzes/root,satyarth934/root,satyarth934/root,buuck/root,lgiommi/root,mattkretz/root,bbockelm/root,zzxuanyuan/root,Y--/root,BerserkerTroll/root,root-mirror/root,lgiommi/root,zzxuanyuan/root,gganis/root,mattkretz/root,gganis/root,abhinavmoudgil95/root,abhinavmoudgil95/root,thomaskeck/root,zzxuanyuan/root,olifre/root,bbockelm/root,Y--/root,agarciamontoro/root,satyarth934/root,gganis/root,abhinavmoudgil95/root,krafczyk/root,mkret2/root,pspe/root,thomaskeck/root,karies/root,abhinavmoudgil95/root,georgtroska/root,veprbl/root,mkret2/root,davidlt/root,gganis/root,esakellari/root,beniz/root,mhuwiler/rootauto,satyarth934/root,esakellari/root,gbitzes/root,simonpf/root,mkret2/root,gganis/root,beniz/root,beniz/root,veprbl/root,zzxuanyuan/root,abhinavmoudgil95/root,thomaskeck/root,beniz/root,zzxuanyuan/root,lgiommi/root,CristinaCristescu/root,zzxuanyuan/root-compressor-dummy,davidlt/root,bbockelm/root,mkret2/root,karies/root,CristinaCristescu/root,pspe/root,mhuwiler/rootauto,esakellari/root,zzxuanyuan/root,thomaskeck/root,buuck/root,jrtomps/root,satyarth934/root,agarciamontoro/root,pspe/root,gbitzes/root,karies/root,zzxuanyuan/root,krafczyk/root,thomaskeck/root,zzxuanyuan/root-compressor-dummy,zzxuanyuan/root,buuck/root,buuck/root,sawenzel/root,Y--/root,gganis/root,beniz/root,mhuwiler/rootauto,CristinaCristescu/root,veprbl/root,satyarth934/root,mhuwiler/rootauto,CristinaCristescu/root,thomaskeck/root,BerserkerTroll/root,BerserkerTroll/root,gbitzes/root,CristinaCristescu/root,beniz/root,krafczyk/root,sawenzel/root,Y--/root,karies/root,agarciamontoro/root,veprbl/root,zzxuanyuan/root-compressor-dummy,simonpf/root,veprbl/root,pspe/root,simonpf/root,buuck/root,krafczyk/root,olifre/root,agarciamontoro/root,pspe/root,BerserkerTroll/root,zzxuanyuan/root-compressor-dummy,bbockelm/root,beniz/root,gganis/root,davidlt/root,georgtroska/root,gganis/root,mattkretz/root,krafczyk/root,krafczyk/root,mattkretz/root,veprbl/root,mattkretz/root,karies/root,karies/root,gbitzes/root,BerserkerTroll/root,zzxuanyuan/root-compressor-dummy,simonpf/root,bbockelm/root,veprbl/root,CristinaCristescu/root,root-mirror/root,buuck/root,pspe/root,davidlt/root,zzxuanyuan/root,veprbl/root,esakellari/root,zzxuanyuan/root-compressor-dummy,georgtroska/root,lgiommi/root,bbockelm/root,satyarth934/root,root-mirror/root,karies/root,georgtroska/root,mattkretz/root,olifre/root,veprbl/root,agarciamontoro/root,simonpf/root,georgtroska/root,jrtomps/root,esakellari/root,pspe/root,mattkretz/root,lgiommi/root,pspe/root,lgiommi/root,bbockelm/root,root-mirror/root,pspe/root,esakellari/root,root-mirror/root,BerserkerTroll/root,root-mirror/root,gbitzes/root,mattkretz/root,agarciamontoro/root,zzxuanyuan/root,zzxuanyuan/root,davidlt/root,sawenzel/root,zzxuanyuan/root-compressor-dummy,krafczyk/root,bbockelm/root,jrtomps/root,thomaskeck/root,simonpf/root,BerserkerTroll/root,mkret2/root,abhinavmoudgil95/root,lgiommi/root,satyarth934/root,BerserkerTroll/root,mattkretz/root,abhinavmoudgil95/root,georgtroska/root,satyarth934/root,bbockelm/root,CristinaCristescu/root,Y--/root,zzxuanyuan/root-compressor-dummy,mkret2/root,agarciamontoro/root,mhuwiler/rootauto,abhinavmoudgil95/root,beniz/root,zzxuanyuan/root-compressor-dummy,olifre/root,jrtomps/root,CristinaCristescu/root,thomaskeck/root,sawenzel/root,thomaskeck/root,buuck/root,mkret2/root,jrtomps/root,olifre/root,Y--/root,esakellari/root,pspe/root,olifre/root,mhuwiler/rootauto,mkret2/root,satyarth934/root,georgtroska/root,karies/root,buuck/root,lgiommi/root,jrtomps/root,veprbl/root,gbitzes/root,georgtroska/root,krafczyk/root,davidlt/root,simonpf/root,mhuwiler/rootauto,buuck/root,davidlt/root,zzxuanyuan/root-compressor-dummy,Y--/root,CristinaCristescu/root,agarciamontoro/root,mattkretz/root,jrtomps/root,olifre/root,gbitzes/root,krafczyk/root,simonpf/root,lgiommi/root,CristinaCristescu/root,olifre/root,davidlt/root,bbockelm/root,Y--/root,krafczyk/root,karies/root,gbitzes/root,esakellari/root,veprbl/root,beniz/root,davidlt/root,mattkretz/root,sawenzel/root,zzxuanyuan/root-compressor-dummy,root-mirror/root,thomaskeck/root,sawenzel/root,esakellari/root,abhinavmoudgil95/root,mkret2/root,jrtomps/root,jrtomps/root,gganis/root,BerserkerTroll/root,lgiommi/root,gbitzes/root,pspe/root,lgiommi/root,sawenzel/root,esakellari/root,jrtomps/root,BerserkerTroll/root,gbitzes/root,georgtroska/root,Y--/root,davidlt/root,simonpf/root,gganis/root,mhuwiler/rootauto,mhuwiler/rootauto,mhuwiler/rootauto,esakellari/root,olifre/root,agarciamontoro/root,beniz/root,buuck/root,root-mirror/root,agarciamontoro/root,CristinaCristescu/root,karies/root,georgtroska/root,bbockelm/root,olifre/root,simonpf/root,sawenzel/root,jrtomps/root,agarciamontoro/root,Y--/root,root-mirror/root,davidlt/root,satyarth934/root,abhinavmoudgil95/root,root-mirror/root