[#3789] Destroy mutable objects only if needed (#3799)

* [#3789] Don't observe objects if they are already mutable objects. Add some null checks.
* Don't destroy mutable in Selection.js if it wasn't created in that context.
* Remove * listeners and add null checks
* Don't delete _observers and _globalEventEmitters on $destroy. Pop all items off the _observers list for a mutable domain object.

Co-authored-by: Andrew Henry <akhenry@gmail.com>

src/plugins/telemetryTable/TelemetryTable.js

@@ -222,11 +222,15 @@ define([
         getColumnMapForObject(objectKeyString) {
             let columns = this.configuration.getColumns();
 
-            return columns[objectKeyString].reduce((map, column) => {
-                map[column.getKey()] = column;
+            if (columns[objectKeyString]) {
+                return columns[objectKeyString].reduce((map, column) => {
+                    map[column.getKey()] = column;
 
-                return map;
-            }, {});
+                    return map;
+                }, {});
+            }
+
+            return {};
         }
 
         addColumnsForObject(telemetryObject) {