rql #298337 gecode_version() in __pkginfo__.py does not catch OSError [validation pending]

OSError can occur, e.g. if g++ is not found in PATH.

prioritynormal
typebug
done in0.33.2
load left0.000
closed by#336a9117fa1e [pkg] don't crash if g++ is not in $PATH
patch[pkg] don't crash if g++ is not in $PATH [applied]