fixed the error when paragraph above the image link has white spaces

at line 27, I have added patterns for white spaces at the end of the previous paragraph: `[\s]+]?`

app.py

@@ -15,13 +15,16 @@ def fix_imgs(src, dst):
     return re.sub(r'!\[\[([^.]+)\.\w+(\|\d+)?\]\]', repl_img, dst)
     
 def fix_imgs_with_hide(src, dst):
-    result_no_hide = fix_imgs(src, dst)
+    if dst != "":
+        result_no_hide = fix_imgs(src, dst)
+    else:
+        result_no_hide = src
     
     def add_hide_top_func(x):
         add_hide_top = """\n\n[details='Images']"""
         return     f'{x.group(1)}{add_hide_top}{x.group(2)}'
 
-    result_top_hide = re.sub(r'(\w|\?|\.|\`)([\n]+!\[[^|]+\|\S+\]\(\S+\))', add_hide_top_func, result_no_hide)
+    result_top_hide = re.sub(r'([\.|\?|\w|\`][\s]+]?)([\n]+!\[[^|]+\|\S+\]\(\S+\))', add_hide_top_func, result_no_hide)
 
     def add_hide_bottom_func(x):
         add_hide_bottom = """[/details]\n\n"""