resources/page: Add JSON omitzero tag to PageMatcher.Sites

[algojogacor]

Summary

Fixes #14855

Running hugo config with legacy [permalinks] configuration prints empty sites sub-maps because PageMatcher.Sites has no JSON struct tag.

Root Cause

In resources/page/page_matcher.go:54, the Sites sitesmatrix.Sites field has no JSON struct tag. When the field is zero-valued during config output, json.Marshal emits {"matrix":{},"complements":{}}, and the downstream zero-value cleanup pass never calls IsZero() or removes these empty sub-maps.

Fix

Add json:"sites,omitzero" to line 54. Go 1.24+ omitzero calls the IsZero() method during marshal, dropping the field entirely when empty. This matches how the same sitesmatrix.Sites type is already tagged in commands/config.go.

Changes

• resources/page/page_matcher.go: 1 line changed (+1 -1)

Testing

• hugo config with legacy [permalinks] config: No empty sites sub-maps in output ✅
• hugo config without permalinks: No regression ✅
• Existing cascade/PageMatcher behavior: Unaffected (only affects JSON marshaling output) ✅

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[bep]

Thanks; I think I prefer #14861 -- as that one works for all maps recursively and it also respects hugo config --printZero