Cordova does not properly initialize if scheme is set to an illegal value.

[breautek]

Bug Report

Problem

What is expected to happen?

It should be made clear that the scheme is an illegal value, either via an error
or produce a warning and fallback to a legal value.

What does actually happen?

Cordova launches but deviceready never fires.

Information

The issue was initially discovered at apache/cordova-plugin-file#564 (comment)

Command or Code

Inside config.xml at the root level:

 <preference name="scheme" value="app" />
 <preference name="hostname" value="io.globules.test" />

Environment, Platform, Device

Android 6 Emulator (API 23)
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Version information

Checklist

• I searched for existing GitHub issues
• I updated all Cordova tooling to most recent version
• I included all the necessary information above