CLI errors if no package.json is found

Summary:
If you don't have a `package.json` in your project you can't do anything with the cli as it errors. This fixes that by wrapping the reading of the `package.json` file and returns `my-react-native-app` if an error is caught.
Closes https://github.com/facebook/react-native/pull/10207

Differential Revision: D4022113

Pulled By: javache

fbshipit-source-id: ffe940160f9d0b58e630adfab5e0dc9d34b859e5

local-cli/android/android.js

@@ -25,8 +25,14 @@ module.exports = {
   func: android,
   options: [{
     command: '--project-name [name]',
-    default: () => JSON.parse(
+    default: () => {
-      fs.readFileSync('package.json', 'utf8')
+      try {
-    ).name,
+        return JSON.parse(
+          fs.readFileSync('package.json', 'utf8')
+        ).name
+      } catch (e) {
+        return 'unknown-app-name'
+      }
+    },
   }],
 };