Fix issue checkMeshChangesFrameChangePre (#162)

* Bump version

* Fixed no object selected in checkMeshChangesFrameChangePre

* Bump version

src/__init__.py

@@ -25,7 +25,7 @@
     "name": "Stop motion OBJ",
     "description": "Import a sequence of OBJ (or STL or PLY or X3D) files and display them each as a single frame of animation. This add-on also supports the .STL, .PLY, and .X3D file formats.",
     "author": "Justin Jensen",
-    "version": (2, 2, 0, "alpha.22"),
+    "version": (2, 2, 0, "alpha.23"),
     "blender": (2, 83, 0),
     "location": "File > Import > Mesh Sequence",
     "warning": "",

src/stop_motion_obj.py

@@ -56,8 +56,11 @@ def checkMeshChangesFrameChangePre(scene):
     global inRenderMode
     if inRenderMode == True:
         return
-
+    
     obj = bpy.context.object
+    # make sure an object is selected
+    if obj is None:
+        return
 
     # if the selected object is not a loaded and initialized mesh sequence, return
     mss = obj.mesh_sequence_settings

src/version.py

@@ -2,5 +2,5 @@
 # (major, minor, revision, development)
 # example dev version: (1, 2, 3, "beta.4")
 # example release version: (2, 3, 4)
-currentScriptVersion = (2, 2, 0, "alpha.22")
+currentScriptVersion = (2, 2, 0, "alpha.23")
 legacyScriptVersion = (2, 0, 2, "legacy")