fix(nsis): no custom icon

README.md

@@ -74,11 +74,11 @@ For an app that will be shipped to production, you should sign your application.
     ```
     Then you can run `npm run dist` (to package in a distributable format (e.g. dmg, windows installer, deb package)) or `npm run pack` (only generates the package directory without really packaging it. This is useful for testing purposes).
 
-    If you use the two `package.json` files approach, you'll only have your `devDependencies` in your development `package.json` and your `dependencies` in your app `package.json`. To ensure your dependencies are always updated based on both files, simply add `"postinstall": "install-app-deps"` to your development `package.json`. This will basically automatically trigger an `npm install` within your app directory so you don't have to do this work everytime you install/update your dependencies.
+    If you use the [two-package.json project structure](#two-packagejson-structure), you'll only have your `devDependencies` in your development `package.json` and your `dependencies` in your app `package.json`. To ensure your dependencies are always updated based on both files, simply add `"postinstall": "install-app-deps"` to your development `package.json`. This will basically automatically trigger an `npm install` within your app directory so you don't have to do this work everytime you install/update your dependencies.
 
 
 5. If you have native addons of your own that are part of the application (not as a dependency), add `"nodeGypRebuild": true` to the `build` section of your development `package.json`.  
-   :bulb: Don't [use](https://github.com/electron-userland/electron-builder/issues/683#issuecomment-241214075) [`npm`](http://electron.atom.io/docs/tutorial/using-native-node-modules/#using-npm) (neither `.npmrc`) for configuring electron headers. Use [`node-gyp-rebuild`](https://github.com/electron-userland/electron-builder/issues/683#issuecomment-241488783) bin instead.
+   :bulb: Don't [use](https://github.com/electron-userland/electron-builder/issues/683#issuecomment-241214075) [npm](http://electron.atom.io/docs/tutorial/using-native-node-modules/#using-npm) (neither `.npmrc`) for configuring electron headers. Use [node-gyp-rebuild](https://github.com/electron-userland/electron-builder/issues/683#issuecomment-241488783) bin instead.
 
 
 6. Installing the [required system packages](https://github.com/electron-userland/electron-builder/wiki/Multi-Platform-Build).

src/install-app-deps.ts

@@ -26,12 +26,12 @@ async function main() {
     getElectronVersion(devMetadata, devPackageFile)
   ])
 
+  if (results[0] === projectDir) {
+    throw new Error("install-app-deps is only useful for two package.json structure")
+  }
+
   await installDependencies(results[0], results[1], args.arch)
 }
 
-try {
-  main()
-}
-catch (e) {
-  printErrorAndExit(e)
-}
+main()
+  .catch(printErrorAndExit)

src/node-gyp-rebuild.ts

@@ -26,9 +26,5 @@ async function main() {
   })
 }
 
-try {
-  main()
-}
-catch (e) {
-  printErrorAndExit(e)
-}
+main()
+  .catch(printErrorAndExit)

src/targets/nsis.ts

@@ -69,15 +69,17 @@ export default class NsisTarget extends Target {
       APP_DESCRIPTION: appInfo.description,
       VERSION: version,
 
-      MUI_ICON: iconPath,
-      MUI_UNICON: iconPath,
-
       COMPANY_NAME: appInfo.companyName,
 
       PROJECT_DIR: this.packager.projectDir,
       BUILD_RESOURCES_DIR: this.packager.buildResourcesDir,
     }
 
+    if (iconPath != null) {
+      defines.MUI_ICON = iconPath
+      defines.MUI_UNICON = iconPath
+    }
+
     for (let [arch, file] of this.archs) {
       defines[arch === Arch.x64 ? "APP_64" : "APP_32"] = await file
     }