Crash for uncalled completionHandler.

https://bugs.webkit.org/show_bug.cgi?id=274243
rdar://128176183

Reviewed by Wenson Hsieh.

Call the completion handler for all code paths.

* Source/WebKit/UIProcess/Cocoa/WebPageProxyCocoa.mm:
(WebKit::WebPageProxy::getTextIndicatorForID):
(WebKit::WebPageProxy::updateTextIndicatorStyleVisibilityForID):

Canonical link: https://commits.webkit.org/278847@main

Source/WebKit/UIProcess/Cocoa/WebPageProxyCocoa.mm

@@ -1219,8 +1219,10 @@ static bool exceedsRenderTreeSizeSizeThreshold(uint64_t thresholdSize, uint64_t
 
 void WebPageProxy::getTextIndicatorForID(const WTF::UUID& uuid, CompletionHandler<void(std::optional<WebCore::TextIndicatorData>&&)>&& completionHandler)
 {
-    if (!hasRunningProcess())
+    if (!hasRunningProcess()) {
+        completionHandler(std::nullopt);
         return;
+    }
 
     auto textIndicatorData = internals().textIndicatorDataForChunk.getOptional(uuid);
 
@@ -1234,8 +1236,10 @@ static bool exceedsRenderTreeSizeSizeThreshold(uint64_t thresholdSize, uint64_t
 
 void WebPageProxy::updateTextIndicatorStyleVisibilityForID(const WTF::UUID& uuid, bool visible, CompletionHandler<void()>&& completionHandler)
 {
-    if (!hasRunningProcess())
+    if (!hasRunningProcess()) {
+        completionHandler();
         return;
+    }
 
     sendWithAsyncReply(Messages::WebPage::UpdateTextIndicatorStyleVisibilityForID(uuid, visible), WTFMove(completionHandler));
 }