Add a test to check if an empty ID3v2 frame is really skipped.
Add a test to check if an empty ID3v2 frame is really skipped.

pbhd/taglib,MaxLeb/taglib,MaxLeb/taglib,videolabs/taglib,videolabs/taglib,TsudaKageyu/taglib,taglib/taglib,black78/taglib,TsudaKageyu/taglib,pbhd/taglib,taglib/taglib,dlz1123/taglib,dlz1123/taglib,davispuh/taglib,i80and/taglib,davispuh/taglib,davispuh/taglib,TsudaKageyu/taglib,Distrotech/taglib,dlz1123/taglib,Distrotech/taglib,i80and/taglib,pbhd/taglib,taglib/taglib,videolabs/taglib,Distrotech/taglib,i80and/taglib,black78/taglib,MaxLeb/taglib,black78/taglib