iOS we can have zero file descriptors open on an iphone in read only no changes/source files. Failure to check for FD open causes select() to fail and spew error message to log. Put guard clause in
iOS we can have zero file descriptors open on an iphone in read only no changes/source files. Failure to check for FD open causes select() to fail and spew error message to log. Put guard clause in

git-svn-id: http://squeakvm.org/svn/squeak/branches/Cog@2322 fa1542d4-bde8-0310-ad64-8ed1123d492a

Former-commit-id: 60d2d7807e2bd4f4ee6b11951d2b5928ab57fd54
peteruhnak/pharo-vm,peteruhnak/pharo-vm,bencoman/pharo-vm,OpenSmalltalk/vm,timfel/squeakvm,timfel/squeakvm,OpenSmalltalk/vm,bencoman/pharo-vm,bencoman/pharo-vm,peteruhnak/pharo-vm,timfel/squeakvm,timfel/squeakvm,bencoman/pharo-vm,peteruhnak/pharo-vm,timfel/squeakvm,OpenSmalltalk/vm,bencoman/pharo-vm,OpenSmalltalk/vm,peteruhnak/pharo-vm,bencoman/pharo-vm,peteruhnak/pharo-vm,peteruhnak/pharo-vm,peteruhnak/pharo-vm,OpenSmalltalk/vm,bencoman/pharo-vm,timfel/squeakvm,bencoman/pharo-vm,OpenSmalltalk/vm,timfel/squeakvm,OpenSmalltalk/vm,OpenSmalltalk/vm,timfel/squeakvm,bencoman/pharo-vm