Don't crash when removing last account

Summary:
Under certain circumstances, removing the last (or only) remaining account
causes kube to crash.

Steps to reproduce:
1. clear all sink config folders
2. start kube, add a generic IMAP account
3. close kube, reopen kube
4. open accounts list, select "edit"
5. Select "Delete" -> kube crashes

Reviewers: #kube, cmollekopf, aacid

Reviewed By: #kube, cmollekopf

Subscribers: aacid, cmollekopf

Differential Revision: https://phabricator.kde.org/D4517

1 files changed, 5 insertions, 1 deletions

diff --git a/framework/domain/selector.h b/framework/domain/selector.h
index fedb91d2..358eaa9a 100644
--- a/framework/domain/selector.h
+++ b/framework/domain/selector.h
@@ -37,7 +37,11 @@ public:
     void setCurrentIndex(int i) {
         mCurrentIndex = i;
         Q_ASSERT(mModel);
-        setCurrent(mModel->index(mCurrentIndex, 0));
+        if (i >= 0) {
+            setCurrent(mModel->index(mCurrentIndex, 0));
+        } else {
+            setCurrent(QModelIndex());
+        }
     }
 
     void reapplyCurrentIndex();