vcsh: Fix regression introduced in d946b078

github: Closes richih/vcsh#168

vcsh

@@ -425,12 +425,16 @@ use() {
 }
 
 which() {
-	[ -e "$VCSH_COMMAND_PARAMETER" ] || fatal "'$VCSH_COMMAND_PARAMETER' does not exist" 1
-	for VCSH_REPO_NAME in $(list); do
+	output=$(for VCSH_REPO_NAME in $(list); do
 		for VCSH_FILE in $(get_files); do
 			echo "$VCSH_FILE" | grep -q "$VCSH_COMMAND_PARAMETER" && echo "$VCSH_REPO_NAME: $VCSH_FILE"
 		done
-	done | sort -u
+	done | sort -u)
+	if [ -z "$output" ]; then
+		fatal "'$VCSH_COMMAND_PARAMETER' does not exist" 1
+	else
+		echo "$output"
+	fi
 }
 
 write_gitignore() {