fixed wrong condition place

sherlock.py

@@ -369,7 +369,6 @@ 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():
@@ -378,7 +377,7 @@ def main():
                 # 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)