url: relax check to ignore semicolons in URLs

* according to RFC 1738 section 2.2, semicolons are reserved but valid
  characters in URIs
* `urllib.parse.urlparse()` interprets semicolons as `params`
* thus, the check for no params in `is_url()` returns `False` for some
  valid URLs

Author: max-moser

idutils/validators.py

@@ -172,7 +172,7 @@ def is_purl(val):
 def is_url(val):
     """Test if argument is a URL."""
     res = urlparse(val)
-    return bool(res.scheme and res.netloc and res.params == "")
+    return bool(res.scheme and res.netloc)
 
 
 def is_lsid(val):