Grease Pencil - Curve Conversion Improvements:

* Changed hotkey from Alt-C to Alt-Shift-C so that it works when the active object cannot be deselected/deactivated.
* Added option to convert to bezier curves. Note that currently, the handles are simply placed to the same location as the point so that there is an exact match with the gpencil strokes. In future, it would be interesting to investigate using proper curve-fitting algos instead.

source/blender/src/editobject.c

@@ -2828,10 +2828,6 @@ void convertmenu(void)
 	if(G.scene->id.lib) return;
 
 	obact= OBACT;
-	if(obact==0) {
-		gpencil_convert_menu();
-		return;
-	}
 	if(!obact->flag & SELECT) return;
 	if(G.obedit) return;