Eagle(.lbr) footprints not listed in Library Browser

Fixes: lp:1807629
https://bugs.launchpad.net/kicad/+bug/1807629

pcbnew/eagle_plugin.cpp

@@ -768,7 +768,7 @@ void EAGLE_PLUGIN::loadPlain( wxXmlNode* aGraphics )
 
 void EAGLE_PLUGIN::loadLibrary( wxXmlNode* aLib, const wxString* aLibName )
 {
-    if( !aLib || !aLibName )
+    if( !aLib )
         return;
 
     // library will have <xmlattr> node, skip that and get the single packages node