fix crash when installed models < number columns

1. Fixed display crash when the number of installed models is less than
   the number of desired columns to display them.

2. Added --ckpt_convert option to init file.

ldm/invoke/config/invokeai_configure.py

@@ -442,6 +442,13 @@ class editOptsForm(npyscreen.FormMultiPage):
             relx=5,
             scroll_exit=True,
         )
+        self.ckpt_convert = self.add_widget_intelligent(
+            npyscreen.Checkbox,
+            name="Load legacy checkpoint models into memory as diffusers models",
+            value=old_opts.ckpt_convert,
+            relx=5,
+            scroll_exit=True,
+        )
         self.always_use_cpu = self.add_widget_intelligent(
             npyscreen.Checkbox,
             name="Force CPU to be used on GPU systems",
@@ -576,6 +583,7 @@ class editOptsForm(npyscreen.FormMultiPage):
                 "xformers",
                 "always_use_cpu",
                 "embedding_path",
+                "ckpt_convert",
         ]:
             setattr(new_opts, attr, getattr(self, attr).value)
 
@@ -709,6 +717,7 @@ def write_opts(opts: Namespace, init_file: Path):
 --max_loaded_models={int(opts.max_loaded_models)}
 --{'no-' if not opts.safety_checker else ''}nsfw_checker
 --{'no-' if not opts.xformers else ''}xformers
+--{'no-' if not opts.ckpt_convert else ''}ckpt_convert
 {'--free_gpu_mem' if opts.free_gpu_mem else ''}
 {'--always_use_cpu' if opts.always_use_cpu else ''}
 """

ldm/invoke/config/model_install.py

@@ -241,7 +241,8 @@ class addModelsForm(npyscreen.FormMultiPage):
 
     def _get_columns(self)->int:
         window_height, window_width = curses.initscr().getmaxyx()
-        return 4 if window_width > 240 else 3 if window_width>160 else 2 if window_width>80 else 1
+        cols = 4 if window_width > 240 else 3 if window_width>160 else 2 if window_width>80 else 1
+        return min(cols,len(self.installed_models))
 
     def on_ok(self):
         self.parentApp.setNextForm(None)