bin/metadep-expander: do not abort build, if metapackage not available

bin/metadep-expander

@@ -11,8 +11,8 @@ metapkgs="$(grep -e @META "$f" | grep -v '^#')"
 for metapkg in $metapkgs; do
 	metapkg=${metapkg%@META}
 	if ! "$APT_CACHE" show "$metapkg" > /dev/null 2>&1; then
-		echo "Error: Metapackage $metapkg not available!!!"
-		exit 1
+		echo "Warning: Metapackage $metapkg not available!!!" >&2
+		continue
 	fi
 	t="`mktemp`"
 	LANG=C "$APT_CACHE" depends "$metapkg"| grep 'Depends:' |
@@ -23,4 +23,8 @@ for metapkg in $metapkgs; do
 	sed -i "s/$metapkg@META/$metapkg/" "$f"
 	rm -f "$t"
 done
+
+# Cleanup not available metapackages
+sed -i "/@META/d" "$f"
+
 exit 0