Update validator to pass empty string in MLM_LICENSE_FILE without erroring to MATLAB.

Author: Prabhakar Kumar

matlab_proxy/util/mwi/validators.py

@@ -57,7 +57,8 @@ def validate_mlm_license_file(nlm_connections_str):
 
     from .exceptions import NetworkLicensingError
 
-    if nlm_connections_str is None:
+    if not nlm_connections_str:
+        # Handles empty strings and None values
         return None
 
     # Regular expression to match port@hostname,

tests/util/mwi/test_validators.py

@@ -22,14 +22,12 @@
         ("1234"),
         ("hostname"),
         ("1234hostname"),
-        (""),
     ],
     ids=[
         "Invalid path to a license file",
         "NLM string with just port number",
         "NLM string with just hostname",
         "NLM string with just port number and hostname",
-        "empty value",
     ],
 )
 def test_validate_mlm_license_file_invalid_value(MLM_LICENSE_FILE, monkeypatch):