Merge pull request #1550 from RnDMonkey/#1484_fix_empty_styles_pattern

#1484 fix empty styles pattern

modules/images.py

@@ -296,7 +296,7 @@ def apply_filename_pattern(x, p, seed, prompt):
         #currently disabled if using the save button, will work otherwise
         # if enabled it will cause a bug because styles is not included in the save_files data dictionary
         if hasattr(p, "styles"):
-            x = x.replace("[styles]", sanitize_filename_part(", ".join([x for x in p.styles if not x == "None"] or "None"), replace_spaces=False))
+            x = x.replace("[styles]", sanitize_filename_part(", ".join([x for x in p.styles if not x == "None"]) or "None", replace_spaces=False))
 
         x = x.replace("[sampler]", sanitize_filename_part(sd_samplers.samplers[p.sampler_index].name, replace_spaces=False))