generate_html and classdef

[JuanPi]

I am unable to generate html of octave forge packages that use
classdef (e.g. dev version of statistics)
In that case I get the error

Internal error: unsupported help text format 'Not documented' for
'gmdistribution'
error: called from
    generate_package_html at line 174 column 11

Octave 4.1.0+
generate_html 0.1.11

Can you reproduce?

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JuanPi Carbajal
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