fixed wrong condition place

sherlock.py

@@ -369,16 +369,15 @@ def main():
         # Make sure that the sites are supported & build up pruned site database.
         site_data = {}
         site_missing = []
-        site = str()
         for site in args.site_list:
             for existing_site in site_data_all:
                 if site.lower() == existing_site.lower():
                     site_data[existing_site] = site_data_all[existing_site]
-        if not site_data:
-            # Build up list of sites not supported for future error message.
-            site_missing.append(f"'{site}'")
+            if not site_data:
+                # Build up list of sites not supported for future error message.
+                site_missing.append(f"'{site}'")
 
-        if site_missing != []:
+        if site_missing:
             print(f"Error: Desired sites not found: {', '.join(site_missing)}.")
             sys.exit(1)