Merge pull request #82 from joewiz/fix/packages-without-explicit-exist-dependency

[bugfix] Packages w/o explicit eXist dependency are presumed compatible with eXist >=2.2.0

Author: adamretter

modules/versions.xqm

@@ -66,6 +66,8 @@ declare function versions:get-packages-satisfying-exist-version(
             ./requires/@semver-min,
             ./requires/@semver-max
         )
+        or 
+        empty(./requires)
     ]
     => versions:sort-packages()
 };