Fix crash on chrome://internals/web-app when BMO is disabled

This code path forgot to early exit from the function.

Bug: 1104250
Change-Id: I16cdbfeaa8028998014476f590ebe6067eff1c1c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2308438
Auto-Submit: Alan Cutter <alancutter@chromium.org>
Reviewed-by: Daniel Murphy <dmurph@chromium.org>
Commit-Queue: Daniel Murphy <dmurph@chromium.org>
Cr-Commit-Position: refs/heads/master@{#790412}

chrome/browser/ui/webui/internals/web_app/web_app_internals_page_handler_impl.cc

@@ -37,13 +37,17 @@ void WebAppInternalsPageHandlerImpl::IsBmoEnabled(
 
 void WebAppInternalsPageHandlerImpl::GetWebApps(GetWebAppsCallback callback) {
   auto* provider = web_app::WebAppProviderBase::GetProviderBase(profile_);
-  if (!provider)
+  if (!provider) {
     std::move(callback).Run({});
+    return;
+  }
 
   web_app::AppRegistrar& registrar_base = provider->registrar();
   web_app::WebAppRegistrar* registrar = registrar_base.AsWebAppRegistrar();
-  if (!registrar)
+  if (!registrar) {
     std::move(callback).Run({});
+    return;
+  }
 
   std::vector<mojom::web_app_internals::WebAppPtr> result;
   for (const web_app::WebApp& web_app : registrar->AllApps()) {