[BUG] fix broken version inspection if package distribution has None name (#1926)

Fixed the following bug 
pytorch_forecasting\utils\_dependencies\_dependencies.py:19, in
_get_installed_packages_private()
---> 19 package_names = {dist.metadata["Name"] for dist in dists}
TypeError: 'NoneType' object is not subscriptable


#### Reference Issues/PRs
Fixes #1925

#### What does this implement/fix? Explain your changes.
Added exception handling to the original package_names =
{dist.metadata["Name"] for dist in dists}

Author: lohraspco

pytorch_forecasting/utils/_dependencies/_dependencies.py

@@ -16,7 +16,11 @@ def _get_installed_packages_private():
     from importlib.metadata import distributions, version
 
     dists = distributions()
-    package_names = {dist.metadata["Name"] for dist in dists}
+    package_names = {
+        dist.metadata["Name"]
+        for dist in dists
+        if dist.metadata and "Name" in dist.metadata
+    }
     package_versions = {pkg_name: version(pkg_name) for pkg_name in package_names}
     # developer note:
     # we cannot just use distributions naively,