fix: black screen when entry list is empty#723
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When Tools are disabled on a fresh install with no ROMs, the main list is empty but multiple code paths access entries without bounds checks. Added total>0 guards and null-safe patterns to prevent crashes and render a usable empty state instead of a black screen. Fixes LoveRetro#712
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Summary
total>0guards and null-safe patterns to prevent crashes and render a usable empty stateFixes #712
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