Add debug asserts

Author: mjbvz

Common/Product/SharedProject/CommonPackage.cs

@@ -130,6 +130,7 @@ internal void RegisterCommands(IEnumerable<Command> commands, Guid cmdSet) {
         /// <returns></returns>
         public static IWpfTextView GetActiveTextView(System.IServiceProvider serviceProvider) {
             if (serviceProvider == null) {
+                Debug.Assert(false, "No service provider");
                 return null;
             }
 
@@ -179,6 +180,7 @@ public static IComponentModel ComponentModel {
 
         internal static CommonProjectNode GetStartupProject(System.IServiceProvider serviceProvider) {
             if (serviceProvider == null) {
+                Debug.Assert(false, "No service provider");
                 return null;
             }
             var buildMgr = (IVsSolutionBuildManager)serviceProvider.GetService(typeof(IVsSolutionBuildManager));