For those who are interested, I've finally solved my problem (the vertical
space before a subsection which was not automatically swallowed at the top
of a page when the page started with an empty section) by using the pair
'after={\vskip 0em\blank[disable]}' for sections:
\setuphead
[section]
[placehead=empty,
page=yes,
after={\vskip 0em\blank[disable]}]
\setuphead
[subsection]
[placehead=yes,
before={\blank[line]},
after={\blank[line]}]
\setupheadertexts[section]
\showframe
\starttext
\completecontent
\dorecurse{2}
{\section{My section}
\dorecurse{2}
{\subsection{My subsection}
\input knuth}}
\stoptext
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