Problem with EnumRegValue

Please correct me if I'm wrong:

EnumRegValue maybe has an error by design. The example
in NSIS documentation (2.06) shows that comparing the
result to "" can be used as abort criteria for the
loop. In reality those empty "registry variable names"
are allowed and regularly used. So a key where such a
"default value" is set will not be traversed by that
EnumRegValue-loop.

I don't know whether the empty variable name is always
the first one (last EnumRegValue parameter=0) in the loop.

I know that there probably is a workaround using
ReadRegStr and checking the error flag.