Consistent failure on GVIM

To reproduce:

* Create a file that uses a different indentation to your default (ie. tabs instead of spaces)
* Open the file in GVIM and run `:IndentConsistencyCop`
* 'The buffer's indent settings are inconsistent...' message will appear with an option to ignore, change, or 'Wrong, choose correct setting...'
* Click 'Change'

Expected: The settings for the file should update, and the message 'The buffer settings have been changed...' message should appear.

Actual: Settings are changed as expected, but a the following errors appear instead of the success message:

    Error detected while processing function IndentConsistencyCop#IndentConsistencyCop..<SNR>76_IndentBufferConsistencyCop..<SNR>76_ReportBufferSettingsConsistency:

    line   17:
    E605: Exception not caught: ASSERT: Passed buffer settings are equal to actual indent settings.
    Error detected while processing function IndentConsistencyCop#IndentConsistencyCop..<SNR>76_IndentBufferConsistencyCop:
    line   54:
    E171: Missing :endif
    Error detected while processing function IndentConsistencyCop#IndentConsistencyCop:
    line   53:
    E171: Missing :endif

This is more a hack than a real fix, but it solves the problem at hand.