glTF exporter: Fix T65622 Check if texture has a valid image

Referenced by issue #66441, Export as gltf2
Referenced by issue #65622, gltf exporter errors

io_scene_gltf2/__init__.py

@@ -15,7 +15,7 @@
 bl_info = {
     'name': 'glTF 2.0 format',
     'author': 'Julien Duroure, Norbert Nopper, Urs Hanselmann, Moritz Becher, Benjamin Schmithüsen, Jim Eckerlein, and many external contributors',
-    "version": (0, 9, 36),
+    "version": (0, 9, 37),
     'blender': (2, 80, 0),
     'location': 'File > Import-Export',
     'description': 'Import-Export as glTF 2.0',
@@ -595,3 +595,4 @@ def unregister():
     # remove from the export / import menu
     bpy.types.TOPBAR_MT_file_export.remove(menu_func_export)
     bpy.types.TOPBAR_MT_file_import.remove(menu_func_import)
+

io_scene_gltf2/blender/exp/gltf2_blender_gather_material_normal_texture_info_class.py

@@ -38,6 +38,9 @@ def gather_material_normal_texture_info_class(blender_shader_sockets_or_texture_
         tex_coord=__gather_tex_coord(blender_shader_sockets_or_texture_slots, export_settings)
     )
 
+    if texture_info.index is None:
+        return None
+
     return texture_info
 
 
@@ -135,5 +138,7 @@ def __get_tex_from_socket(socket):
         gltf2_blender_search_node_tree.FilterByType(bpy.types.ShaderNodeTexImage))
     if not result:
         return None
+    if result[0].shader_node.image is None:
+        return None
     return result[0]
 

io_scene_gltf2/blender/exp/gltf2_blender_gather_material_occlusion_texture_info_class.py

@@ -35,6 +35,9 @@ def gather_material_occlusion_texture_info_class(blender_shader_sockets_or_textu
         tex_coord=__gather_tex_coord(blender_shader_sockets_or_texture_slots, export_settings)
     )
 
+    if texture_info.index is None:
+        return None
+
     return texture_info
 
 
@@ -109,5 +112,7 @@ def __get_tex_from_socket(socket):
         gltf2_blender_search_node_tree.FilterByType(bpy.types.ShaderNodeTexImage))
     if not result:
         return None
+    if result[0].shader_node.image is None:
+        return None
     return result[0]
 

io_scene_gltf2/blender/exp/gltf2_blender_gather_texture_info.py

@@ -132,5 +132,7 @@ def __get_tex_from_socket(socket):
         gltf2_blender_search_node_tree.FilterByType(bpy.types.ShaderNodeTexImage))
     if not result:
         return None
+    if result[0].shader_node.image is None:
+        return None
     return result[0]