fixup: added undefined to git info in Allwmake for shell failure

Author: colemanjs

applications/solvers/additiveFoam/Allwmake

@@ -7,8 +7,8 @@ cd ${0%/*} || exit 1    # Run from this directory
 #------------------------------------------------------------------------------
 # Generate header for git information
 HEADER_FILE="${0%/*}/Make/gitInfo.H"
-GIT_DESCRIBE=$(git describe --tags --always 2>/dev/null)
-GIT_SHA1=$(git rev-parse HEAD 2>/dev/null)
+GIT_DESCRIBE=$(git describe --tags --always 2>/dev/null) || GIT_DESCRIBE="undefined"
+GIT_SHA1=$(git rev-parse HEAD 2>/dev/null) || GIT_SHA1="undefined"
 
 cat > "$HEADER_FILE" << EOF
 #ifndef gitInfo_H