Fix crash for projects without a remote on haxelib

Previously, the assumption was that there's a remote on lib.haxe.org for every project installed in haxelib, which does not have to be the case (for example when a project was installed via `haxelib git`). This led to a crash.

There are no infos available for projects without a remote (making the manage project popup useless) - in the future, the local `haxelib.json` file should be parsed for such projects. This pull at least prevents the crashing.