getting Travis building for Linux

.travis.yml

@@ -3,8 +3,24 @@ notifications:
     on_success: never
     on_failure: change
 
-os:
-  - osx
+dist: trusty
+
+matrix:
+  include:
+    - os: linux
+      env: CC=clang CXX=clang++ npm_config_clang=1
+      compiler: clang
+
+addons:
+  apt:
+    packages:
+      # by default the container VMs have Git 1.9.1, ermagherd...
+      - git-all
+      # this is required to compile keytar
+      - libsecret-1-dev
+      # this package is essential for testing Electron in a headless fashion
+      # https://github.com/electron/electron/blob/master/docs/tutorial/testing-on-headless-ci.md
+      - xvfb
 
 branches:
   only:

app/src/lib/editors/lookup.ts

@@ -31,9 +31,11 @@ export async function getAvailableEditors(): Promise<
     return editorCache
   }
 
-  return Promise.reject(
+  log.warn(
     `Platform not currently supported for resolving editors: ${process.platform}`
   )
+
+  return []
 }
 
 /**
@@ -49,9 +51,10 @@ export function getFirstEditorOrDefault(): Promise<FoundEditor | null> {
     return getFirstEditorOrDefaultWindows()
   }
 
-  return Promise.reject(
+  log.warn(
     `Platform not currently supported for resolving editors: ${process.platform}`
   )
+  return Promise.resolve(null)
 }
 
 /**