Fix pkg state regression
Fix pkg state regression

acd949c and 0b5ce09 broke the pkg state, such that for single pkg
installs (i.e. no "pkgs" or "sources"), if the version arg is not
provided, a package will always be interpreted by the pkg state as being
installed, and the package will never be installed. This commit fixes
that regression.

saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt