MD file preview is broken when table contains empty rows
### Summary If original MD file contains table with empty row, the preview is broken (see screenshoots) ### Steps to reproduce - add table to MD file - add empty row (on our project we use empty rows to separate group of rows) ### What is the current *bug* behavior? Preview is broken ### What is the expected *correct* behavior? Preview shows table with thin empty row ### Relevant logs and/or screenshots source ![Screenshot_2018-12-26_at_13.33.09](/uploads/10f5094687aeaf1a0145334808f1d554/Screenshot_2018-12-26_at_13.33.09.png) preview ![Screenshot_2018-12-26_at_13.32.59](/uploads/373db2d38569c1e0997c39be6f2ee043/Screenshot_2018-12-26_at_13.32.59.png) GitLab Community Edition 11.5.3
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