added checks to avoid segfaults when closing the application

git-svn-id: https://lmms.svn.sf.net/svnroot/lmms/trunk/lmms@253 0778d3d1-df1d-0410-868b-ea421aaaa00d

src/core/track_container.cpp

@@ -248,7 +248,10 @@ void trackContainer::removeTrack( track * _track )
 		eng()->getMixer()->play();
 
 		realignTracks();
-		eng()->getSongEditor()->setModified();
+		if( eng()->getSongEditor() )
+		{
+			eng()->getSongEditor()->setModified();
+		}
 	}
 }
 

src/lib/journalling_object.cpp

@@ -58,7 +58,7 @@ journallingObject::journallingObject( engine * _engine ) :
 
 journallingObject::~journallingObject()
 {
-	if( eng() != NULL )
+	if( eng() && eng()->getProjectJournal() )
 	{
 		eng()->getProjectJournal()->freeID( id() );
 	}