I was thinking more in this direction:

d = dict()
d[action in not None and 'action'] = action
d[minval > 0 and 'minval'] = minval
...
del d[False]

There are few things I do not particularly like about this (assigning to
dict, even when value is discarded later, or necessity of the del
d[False]), but I guess it is as expressive as it could be and I could
imagine using it in my app easily. If needed one can even define another
key instead of False.
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