fix issues with outpaint merge

ldm/invoke/args.py

@@ -169,8 +169,12 @@ class Args(object):
 
     def parse_cmd(self,cmd_string):
         '''Parse a invoke>-style command string '''
+        # handle the case in which the first token is a switch
+        if cmd_string.startswith('-'):
+            prompt = ''
+            switches = cmd_string
         # handle the case in which the prompt is enclosed by quotes
-        if cmd_string.startswith('"'):
+        elif cmd_string.startswith('"'):
             a = shlex.split(cmd_string)
             prompt = a[0]
             switches = shlex.join(a[1:])

ldm/invoke/generator/omnibus.py

@@ -42,6 +42,8 @@ class Omnibus(Img2Img,Txt2Img):
         )
 
         if isinstance(init_image, Image.Image):
+            if init_image.mode=='RGBA':
+                init_image = init_image.convert('RGB')
             init_image = self._image_to_tensor(init_image)
 
         if isinstance(mask_image, Image.Image):