Addendum:
When I open the lid again, here is what happens in the cases 1) and 2) 
described above:

1) laptop screen is switched back on in native resolution, external
monitor is switched off (no signal) and has to be re-activated in System
> Preferences > Display > "laptop off", "external on"

2) the laptop screen remains switched off and the external monitor works
fine again in highest resolution

Interesting: behaviors 1) and 2) alternate when I close and open the lid
several times in a row (each time re-activating the external screen
after behavior 1)). The Power Management setting remain unaffected on
"do nothing" during all this.

-- 
[Regression] No "do nothing" for laptop lid closed action
https://bugs.launchpad.net/bugs/416236
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