CB-11380 (ios) Fixed an unexpected error callback when initializing M…

[alsorokin]

Platforms affected

iOS

What does this PR do?

Eliminates an unexpected error callback when initializing Media with the file that doesn't exist:
https://issues.apache.org/jira/browse/CB-11380

What testing has been done on this change?

Tested manually on iOS 8.1

Checklist

• ICLA has been signed and submitted to secretary@apache.org.
• Reported an issue in the JIRA database
• Commit message follows the format: "CB-3232: (android) Fix bug with resolving file paths", where CB-xxxx is the JIRA ID & "android" is the platform affected.
• Added automated test coverage as appropriate for this change.

[alsorokin]

@shazron could you please help review this?

This fixes a regression caused by #85

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[shazron]

LGTM 👍

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Cordova CI Build has completed successfully.

Commit - Link
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Builder Name	Console Output	Test Report	Device Logs
Windows 8.1 Store	Link	Link	Link
Windows 10 Store	Link	Link	Link
Windows 8.1 Phone	Link	Link	Link
iOS	Link	Link	Link
Android	Link	Link	Link