macOS: Fix a regression in the previous release that caused a crash when pressing a unprintable key, such as the POWER key

Fixes #1997

docs/changelog.rst

@@ -4,6 +4,13 @@ Changelog
 |kitty| is a feature full, cross-platform, *fast*, GPU based terminal emulator.
 To update |kitty|, :doc:`follow the instructions <binary>`.
 
+0.14.6 [2019-09-23]
+---------------------
+
+- macOS: Fix a regression in the previous release that caused a crash when
+  pressing a unprintable key, such as the POWER key (:iss:`1997`)
+
+
 0.14.5 [2019-09-23]
 ---------------------
 

glfw/cocoa_window.m

@@ -345,10 +345,12 @@ static int translateKey(unsigned int key, bool apply_keymap)
         // Look for the effective key name after applying any keyboard layouts/mappings
         const char *name_chars = _glfwPlatformGetScancodeName(key);
         uint32_t name = 0;
-        for (int i = 0; i < 4; i++) {
-            if (!name_chars[i]) break;
-            name <<= 8;
-            name |= (uint8_t)name_chars[i];
+        if (name_chars) {
+            for (int i = 0; i < 4; i++) {
+                if (!name_chars[i]) break;
+                name <<= 8;
+                name |= (uint8_t)name_chars[i];
+            }
         }
         if (name) {
             // Key name