uxtheme Prevent segfault if no theme is set

[Kevin Koltzau]

This follows the same lines, in some cases MSSTYLES_SetActiveTheme would return success when in fact it failed
Apply on top of Vitaliy's patch

Changelog:
	Ensure MSSTYLES_SetActiveTheme fails when theme fails to load

On Saturday 24 January 2004 01:28 pm, Vitaliy Margolen wrote:
> Vitaliy Margolen
>
> changelog:
>  - Prevent segfault if no theme is set
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