add batch count to sd upscale #169

fix writing empty prompt pictures to rroot directory instead of 'empty'
suppress 'Denoising strength change factor' text inimage info unless using loopback mode

modules/images.py

@@ -259,7 +259,7 @@ def save_image(image, path, basename, seed=None, prompt=None, extension='png', i
 
     if opts.save_to_dirs and not no_prompt:
         words = re_nonletters.split(prompt or "")
-        if len(words) == 0:
+        if len(words[0]) == 0:
             words = ["empty"]
 
         dirname = " ".join(words[0:opts.save_to_dirs_prompt_len]).strip()