avoid exception when highlighting empty code blocks
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@ -117,6 +117,9 @@ c:[{cN:"comment",b:/\(\*/,e:/\*\)/},e.ASM,e.QSM,e.CNM,{b:/\{/,e:/\}/,i:/:/}]}});
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hljs.highlightBlock( block );
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// Don't generate line numbers for empty code blocks
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if( block.innerHTML.trim().length === 0 ) return;
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if( block.hasAttribute( 'data-line-numbers' ) ) {
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hljs.lineNumbersBlock( block, { singleLine: true } );
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