Make the terminal work in linux with gsettings available but no config set

Author: pimterry

.travis.yml

@@ -5,7 +5,7 @@ node_js:
 - '10'
 - '8'
 before_install:
-- sudo apt-get install p7zip-full
+- sudo apt-get install p7zip-full xterm
 install:
 - npm install --global npm@4
 - npm install

src/interceptors/fresh-terminal.ts

@@ -30,12 +30,15 @@ const getTerminalCommand = _.memoize(async (): Promise<SpawnArgs | null> => {
         }
     } else if (process.platform === 'linux') {
         if (GSettings.isAvailable()) {
-            const defaultTerminal = GSettings.Key.findById(
+            const gSettingsTerminalKey = GSettings.Key.findById(
                 'org.gnome.desktop.default-applications.terminal', 'exec'
-            ).getValue();
+            );
 
+            const defaultTerminal = gSettingsTerminalKey && gSettingsTerminalKey.getValue();
             if (defaultTerminal) return { command: defaultTerminal };
-        } else if (await commandExists('xterm').catch(() => false)) {
+        }
+
+        if (await commandExists('xterm').catch(() => false)) {
             return { command: 'xterm' };
         }
     } else if (process.platform === 'darwin') {