Feature summary (what you would like to be able to do and where):
When AWB genfixes encounter an empty section with a duplicate section header, delete the duplicate header.

Use case(s) (list the steps that you performed to discover that problem, and describe the actual underlying problem which you want to solve. Do not describe only a solution):

• Load [[Charles Jacquin et Cie]] with genfixes
• AWB finds an External links header followed immediately with another External links header
• AWB marks the first section with the {{empty section}} template

Benefits (why should this be implemented?):
Removing the empty duplicate header would be more efficient than adding a maintenance tag that another editor has to resolve manually,