RSS Feed/News Bug: `<xf:reactions>` template tag missing assertAttribute('link') validation, causing E_WARNING crash instead of proper compiler error

[ENXF NET]

File: src/XF/Template/Compiler/Tag/Reactions.php

Summary:​

The <xf:reactions> template tag compiler accesses $tag->attributes['link'] at line 25 without first calling assertAttribute('link'). If a developer uses <xf:reactions> without the required link attribute, template compilation fatally crashes with a raw PHP E_WARNING that XF's error handler promotes to an ErrorException, instead of receiving...

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