Apply suggestion from @casparvl

Co-authored-by: Caspar van Leeuwen <33718780+casparvl@users.noreply.github.com>

Author: bedroge

eb_hooks.py

@@ -158,6 +158,7 @@ def get_cuda_version(ec, check_deps=True, check_builddeps=True):
     If (ec) is simply CUDA itself, it will return the version.
     If no CUDA is used as (build)dependency, this function returns None.
     """
+    # Provide default
     cudaver = None
     ec_dict = ec.asdict()