Fixes crash when all faces are selected.

Thanks go to Czarek Kopias for the bug report and proposing a fix.

mesh_f2.py

@@ -21,8 +21,8 @@
 bl_info = {
     'name': "F2",
     'author': "Bart Crouch",
-    'version': (1, 4, 0),
-    'blender': (2, 65, 9),
+    'version': (1, 5, 0),
+    'blender': (2, 66, 3),
     'location': "Editmode > F",
     'warning': "",
     'description': "Extends the 'Make Edge/Face' functionality",
@@ -249,8 +249,14 @@ class MeshF2(bpy.types.Operator):
         bm = bmesh.from_edit_mesh(context.active_object.data)
         sel = [v for v in bm.verts if v.select]
         if len(sel) > 2:
+            if len([True for f in bm.faces if f.select]) == len(bm.faces):
+                # all faces selected, can't create new one
+                return {'CANCELLED'}
             # original 'Make Edge/Face' behaviour
-            bpy.ops.mesh.edge_face_add()
+            try:
+                bpy.ops.mesh.edge_face_add('INVOKE_DEFAULT')
+            except:
+                pass
         elif len(sel) == 1:
             # single vertex selected -> mirror vertex and create new face
             quad_from_vertex(bm, sel[0], context, event)