drm_hwcomposer: Fix headless mode
The headless mode has a nullptr pipeline, which causes crash a when dereferenced.
Fixes: 851ea4dc ("drm_hwcomposer: Implement getHdrCapabilities and getColorModes")
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The headless mode has a nullptr pipeline, which causes crash a when dereferenced.
Fixes: 851ea4dc ("drm_hwcomposer: Implement getHdrCapabilities and getColorModes")