small fix for new variable editor types (#55195)

public/app/plugins/datasource/graphite/components/GraphiteVariableEditor.tsx

@@ -30,14 +30,21 @@ export const GraphiteVariableEditor = (props: Props) => {
           width={25}
           value={value.queryType ?? GraphiteQueryType.Default}
           onChange={(selectableValue) => {
+            setValue({
+              ...value,
+              queryType: selectableValue.value,
+            });
+
+            if (value.target) {
               onChange({
                 ...value,
                 queryType: selectableValue.value,
               });
+            }
           }}
         />
       </InlineField>
-      <InlineField label="Select query type" labelWidth={20} grow>
+      <InlineField label="Query" labelWidth={20} grow>
         <Input
           aria-label="Variable editor query input"
           value={value.target}