modulecmd: unbound variables fixed in get_available_modules()

Pmodules/modulecmd.bash.in

@@ -783,6 +783,7 @@ subcommand_load() {
 				output+="module use ${relstage}; "
 			fi
 			local group=${line[2]}
+			#echo "group=${group}" 1>&2
 			[[ "${group}" != 'none' ]] || continue
 	        	if [[ ! ":${UsedGroups}:" == *:${group}:* ]] && \
 				   (( ${GroupDepths[${group}]} == 0 )); then
@@ -1279,7 +1280,7 @@ get_available_modules() {
 				long_module_name="${toks[-2]}/${toks[-1]}"
 			fi
 			[[ -n ${OverlayExcludes} \
-				   && "${mod}" =~ ${OverlayExcludes} ]] && continue
+				   && "${long_module_name}" =~ ${OverlayExcludes} ]] && continue
 			local add='no'
 			if [[ -n "${ol_name}" && "${ol_name,,}" != 'none' ]]; then
 				# module is in an overlay