From 9cd4df1d88bcede697e5022eb94c9fdc5dddd2ba Mon Sep 17 00:00:00 2001
From: "Veronica K. B. Olsen" <1619840+vkbo@users.noreply.github.com>
Date: Sun, 31 May 2020 14:41:49 +0200
Subject: [PATCH] Added some comments

---
 nw/guimain.py | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/nw/guimain.py b/nw/guimain.py
index cad673de..bfc98c71 100644
--- a/nw/guimain.py
+++ b/nw/guimain.py
@@ -1019,6 +1019,9 @@ class GuiMain(QMainWindow):
         return
 
     def _treeDoubleClick(self, tItem, colNo):
+        """The user double-clicked an item in the tree. If it is a file,
+        we open it. Otherwise, we do nothing.
+        """
         tHandle = tItem.text(self.treeView.C_HANDLE)
         logger.verbose("User double clicked tree item with handle %s" % tHandle)
         nwItem = self.theProject.projTree[tHandle]
@@ -1031,14 +1034,18 @@ class GuiMain(QMainWindow):
         return
 
     def _treeKeyPressReturn(self):
+        """The user pressed return an item in the tree. If it is a file,
+        we open it. Otherwise, we do nothing.
+        """
         tHandle = self.treeView.getSelectedHandle()
         logger.verbose("User pressed return on tree item with handle %s" % tHandle)
         nwItem = self.theProject.projTree[tHandle]
-        if nwItem.itemType == nwItemType.FILE:
-            logger.verbose("Requested item %s is a file" % tHandle)
-            self.openDocument(tHandle)
-        else:
-            logger.verbose("Requested item %s is a folder" % tHandle)
+        if nwItem is not None:
+            if nwItem.itemType == nwItemType.FILE:
+                logger.verbose("Requested item %s is a file" % tHandle)
+                self.openDocument(tHandle)
+            else:
+                logger.verbose("Requested item %s is a folder" % tHandle)
         return
 
     def _keyPressEscape(self):