Blogger can be notorious sometimes during customization. One of the unwanted error message you get as a blogger is Required field must not be left blank error message when trying to add a gadget such as image gadgets, search box gadgets and some others without title.
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See the image above as illustration:
How To Remove Required field must not be left blank Error Message In Blogger
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Now, to get rid of the must add title error, during the edition, simple add the code below instead of the title;
<! >
Yes! use <! > as your title. Then you are done.