[configuration-script] Return default values if node is removed

This fixes hot reload of intellj.yaml config:
when some entry existed and was removed, state returns
field's default value instead of value cached before
removal.

This change affects only internal projects which
use intellij.yaml config.

GitOrigin-RevId: e9cd64e191ecd86adf46979d81e6eca315aba169

plugins/configuration-script/src/providers/ConfigurationScriptProjectStoreFactory.kt

@@ -108,8 +108,10 @@ private class ReadOnlyStorage(val configurationSchemaKey: String, val componentC
       }
     }
 
-    val node = configurationFileManager.findValueNode(configurationSchemaKey) ?: return null
-    readIntoObject(state, node)
+    val node = configurationFileManager.findValueNode(configurationSchemaKey)
+    if (node != null) {
+      readIntoObject(state, node)
+    }
     @Suppress("UNCHECKED_CAST")
     return state as T
   }