From b59f9b9b2c89d3240a35958eafebf8660865f205 Mon Sep 17 00:00:00 2001
From: Eike Ziller <eike.ziller@qt.io>
Date: Fri, 25 Jan 2019 16:02:22 +0100
Subject: [PATCH] Help: Do not actually try to lookup empty identifiers or
 keywords

Avoid the unneeded database lookup.

Change-Id: I077e3bdcc30543fd903c6fc62da814b4c84f0d25
Reviewed-by: David Schulz <david.schulz@qt.io>
---
 src/plugins/help/helpmanager.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/plugins/help/helpmanager.cpp b/src/plugins/help/helpmanager.cpp
index 5f7943b3428..3391d94740a 100644
--- a/src/plugins/help/helpmanager.cpp
+++ b/src/plugins/help/helpmanager.cpp
@@ -226,12 +226,16 @@ QSet<QString> HelpManager::userDocumentationPaths()
 QMap<QString, QUrl> HelpManager::linksForKeyword(const QString &key)
 {
     QTC_ASSERT(!d->m_needsSetup, return {});
+    if (key.isEmpty())
+        return {};
     return d->m_helpEngine->linksForKeyword(key);
 }
 
 QMap<QString, QUrl> HelpManager::linksForIdentifier(const QString &id)
 {
     QTC_ASSERT(!d->m_needsSetup, return {});
+    if (id.isEmpty())
+        return {};
     return d->m_helpEngine->linksForIdentifier(id);
 }