conda search behaves inconsistently for packages which don't exist at all vs packages for which the specific version doen't exist

[mingwandroid]

Testing on conda 4.3, roughly

On macOS, neither 'r-vars=1.5_2=r3.3.1_' nor 'r-lattice=0.20_34=r3.3.1_' exist (though other versions of r-lattice do):

$ conda search --override-channels -c r --spec 'r-lattice=0.20_34=r3.3.1_*'
Fetching package metadata ...........


PackageNotFoundError: Package not found: '' Package missing in current osx-64 channels: 
  - r-lattice 0.20_34* r3.3.1_*

$ echo $?
1

$ conda search --override-channels -c r --spec 'r-vars=1.5_2=r3.3.1_*'
Fetching package metadata ...........

$ echo $?
0

I am currently working around this by checking the number of lines in stdout which is not ideal.

[kalefranz]

Per spot tests, this appears to be resolved in conda 4.4.

[github-actions]

Hi there, thank you for your contribution to Conda!

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