Installed filter doesn't work without a version and operator?

I tried this in a node body:

[condition installed block]
This part should display if Block is enabled.
[/condition]

It did not work as I expected -- I think the condition is not evaluating to TRUE even though I do have the Block module installed.

This condition worked:

[condition installed block >= 7.0]
This part should display if Block is enabled.
[/condition]

I would like the "installed" conditions to work even if the operator and version number are not included.