ng generate errors out when no app prefeix is set

[SanderElias]

Versions

6

Repro steps

ng new someproject
cd someproject
// edit angular.json
ng g component demo 

The edit in angular.json is setting the prefix to ""

Observed behavior

Desired behavior

No error. It is perfectly legal to not have a prefix. (might be unwise, but still). The thing should check if there will be a - in there, as the standards demand that for custom elements.

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