Fix resolution with bad (empty) releases

CHANGELOG.md

 # Change Log
 # Change Log
 
 
+## [Unreleased]
+
+### Fixed
+
+- Fixed resolution with bad (empty) releases.
+
+
 ## [0.8.0] - 2018-04-13
 ## [0.8.0] - 2018-04-13
 
 
 ### Added
 ### Added

poetry/repositories/pypi_repository.py

@@ -89,6 +89,10 @@ class PyPiRepository(Repository):
         versions = []
         versions = []
 
 
         for version, release in info['releases'].items():
         for version, release in info['releases'].items():
+            if not release:
+                # Bad release
+                continue
+
             if (
             if (
                 not constraint
                 not constraint
                 or (constraint and constraint.matches(Constraint('=', version)))
                 or (constraint and constraint.matches(Constraint('=', version)))