Bugfix panic in D3D11RenderEngine->restore #184
Merged
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When self.ps_instances is none, self.ps_instances_count is 0, then slice::from_raw_parts causes a panic here.
Same for the vs version. Initially I tried this fix with is_some() but it still caused a crash for me.
I don't know if this has any side effects, for me it renders fine after this fix.