From d65baaf49977e8be62fbe26e5c155424e25c69ee Mon Sep 17 00:00:00 2001
From: Krzysztof Kowalczyk <kkowalczyk@gmail.com>
Date: Wed, 1 Jun 2022 21:08:50 -0400
Subject: [PATCH] don't crash with bad ExternalViewers entri

---
 src/Menu.cpp | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/Menu.cpp b/src/Menu.cpp
index 762859563a7c..dc4bd16862f2 100644
--- a/src/Menu.cpp
+++ b/src/Menu.cpp
@@ -1148,7 +1148,7 @@ static void AppendExternalViewersToMenu(HMENU menuFile, const WCHAR* filePath) {
         if (count >= maxEntries) {
             break;
         }
-        if (!ev->commandLine) {
+        if (str::EmptyOrWhiteSpaceOnly(ev->commandLine)) {
             continue;
         }
         if (ev->filter && !(filePath && PathMatchFilter(filePath, ev->filter))) {
@@ -1156,10 +1156,10 @@ static void AppendExternalViewersToMenu(HMENU menuFile, const WCHAR* filePath) {
         }
 
         WCHAR* name = ToWstrTemp(ev->name);
-        if (str::IsEmpty(name)) {
+        if (str::EmptyOrWhiteSpaceOnly(ev->name)) {
             CmdLineArgsIter args(ToWstrTemp(ev->commandLine));
             int nArgs = args.nArgs - 2;
-            if (nArgs == 0) {
+            if (nArgs <= 0) {
                 continue;
             }
             WCHAR* arg0 = args.at(2 + 0);