fix null bug
fix null bug

sferoze/quilljs,voxmedia/quill,sferoze/quilljs,tim-mc/quill,quilljs/quill,fraywing/quill,sferoze/quilljs,sferoze/quilljs,willrowe/quill,willrowe/quill,fraywing/quill,quilljs/quill,tim-mc/quill,quilljs/quill,voxmedia/quill,voxmedia/quill,willrowe/quill