ATOM-15287 Materials Disappear When Hot Reloading Parent Materials (#1532)

The issue was because the material wasn't compiled when creating the draw packet

Gems/Atom/Tools/MaterialEditor/Code/Source/Document/MaterialDocument.cpp

@@ -567,11 +567,13 @@ namespace MaterialEditor
     {
         if (m_compilePending)
         {
-            m_materialInstance->Compile();
+            if (m_materialInstance->Compile())
+            {
                 m_compilePending = false;
                 AZ::TickBus::Handler::BusDisconnect();
             }
         }
+    }
 
     void MaterialDocument::SourceFileChanged(AZStd::string relativePath, AZStd::string scanFolder, AZ::Uuid sourceUUID)
     {