fix(plugins/plugin-client-common): regression: non-empty repl output has 'ok' at the end

Fixes #4924

Author: myan9

plugins/plugin-client-common/src/components/Views/Terminal/Block/Output.tsx

@@ -60,7 +60,7 @@ type Props = {
 } & BlockViewTraits
 
 interface State {
-  assertHasContent: boolean
+  assertHasContent?: boolean
   isResultRendered: boolean
 
   streamingOutput: Streamable[]
@@ -79,7 +79,6 @@ export default class Output extends React.PureComponent<Props, State> {
     }
 
     this.state = {
-      assertHasContent: false,
       isResultRendered: false,
       streamingOutput: [],
       streamingConsumer