Added connectivity check for other source control setups.

Author: JimmyDeemo

source/VersionHandlerImpl/src/ProjectSettings.cs

@@ -406,7 +406,9 @@ private static void Save() {
                     return;
                 }
                 Directory.CreateDirectory(Path.GetDirectoryName(PROJECT_SETTINGS_FILE));
-                if (UnityEditor.VersionControl.Provider.enabled && UnityEditor.VersionControl.Provider.isActive) {
+                if (UnityEditor.VersionControl.Provider.enabled && UnityEditor.VersionControl.Provider.isActive &&
+                    (!UnityEditor.VersionControl.Provider.requiresNetwork ||
+                     UnityEditor.VersionControl.Provider.onlineState == UnityEditor.VersionControl.OnlineState.Online)) {
                     var task = UnityEditor.VersionControl.Provider.Checkout(PROJECT_SETTINGS_FILE, 
                                                                         UnityEditor.VersionControl.CheckoutMode.Exact);
                     task.Wait();