Fix the generator for add-ons when killing the backend if CTRL+C whil… #14407

Job	Run time
Core Basic (18.x)	6m 17s
Core Blocks (18.x)	7m 20s
Core Basic (20.x)	6m 45s
Core Blocks (20.x)	7m 16s
Core Content (18.x)	3m 31s
Core Control Panels (18.x)	4m 14s
Core Content (20.x)	3m 21s
Core Basic - Plone 5 (18.x)	6m 49s
Core Control Panels (20.x)	4m 6s
Core Blocks - Listing (18.x)	5m 20s
Coresandbox (18.x)	4m 35s
Core Blocks - Listing (20.x)	5m 12s
Core Volto Slate (18.x)	7m 19s
Core Volto Slate (20.x)	7m 29s
Guillotina (18.x)	3m 51s
Project Generator (18.x)	5m 6s
Multilingual (18.x)	3m 37s
Project Generator (20.x)	4m 58s
Multilingual in Seamless Mode (18.x)	3m 43s
Seamless Mode (18.x)	7m 24s
Working Copy (18.x)	3m 47s
	1h 52m 0s

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