Merge pull request #5627 from deanpress/patch-1

fix: fallback model_checkpoint if it's empty

modules/sd_models.py

@@ -111,6 +111,10 @@ def model_hash(filename):
 
 def select_checkpoint():
     model_checkpoint = shared.opts.sd_model_checkpoint
+    
+    if len(model_checkpoint) == 0:
+        model_checkpoint = shared.default_sd_model_file
+        
     checkpoint_info = checkpoints_list.get(model_checkpoint, None)
     if checkpoint_info is not None:
         return checkpoint_info