further tweaks to model management

- Work around problem with OmegaConf.update() that prevented model names
  from containing periods.
- Fix logic bug in !delete_model that didn't check for existence of model
  in config file.

ldm/invoke/CLI.py

@@ -613,8 +613,6 @@ def import_diffuser_model(path_or_repo:str, gen, opt, completer)->str:
             description = model_description):
         print('** model failed to import')
         return None
-    if input('Make this the default model? [n] ').startswith(('y','Y')):
-        manager.set_default_model(model_name)
     return model_name
 
 def import_ckpt_model(path_or_url:str, gen, opt, completer)->str:
@@ -647,8 +645,6 @@ def import_ckpt_model(path_or_url:str, gen, opt, completer)->str:
         print('** model failed to import')
         return None
 
-    if input('Make this the default model? [n] ').startswith(('y','Y')):
-        manager.set_model_default(model_name)
     return model_name
 
 def _verify_load(model_name:str, gen)->bool:
@@ -726,6 +722,9 @@ def del_config(model_name:str, gen, opt, completer):
     if model_name == current_model:
         print("** Can't delete active model. !switch to another model first. **")
         return
+    if model_name not in gen.model_manager.config:
+        print(f"** Unknown model {model_name}")
+        return
     gen.model_manager.del_model(model_name)
     gen.model_manager.commit(opt.conf)
     print(f'** {model_name} deleted')

ldm/invoke/model_manager.py

@@ -230,6 +230,9 @@ class ModelManager(object):
         Delete the named model.
         '''
         omega = self.config
+        if model_name not in omega:
+            print(f'** Unknown model {model_name}')
+            return
         del omega[model_name]
         if model_name in self.stack:
             self.stack.remove(model_name)
@@ -253,9 +256,8 @@ class ModelManager(object):
 
         assert (clobber or model_name not in omega), f'attempt to overwrite existing model definition "{model_name}"'
 
-        if model_name not in omega:
-            omega[model_name] = dict()
-        OmegaConf.update(omega,model_name,model_attributes,merge=False)
+        omega[model_name] = model_attributes
+        
         if 'weights' in omega[model_name]:
             omega[model_name]['weights'].replace('\\','/')