Fix packages not found for custom repositories

CHANGELOG.md

@@ -15,6 +15,7 @@
 - Fixed versions detection in custom repositories.
 - Fixed package finding with multiple custom repositories.
 - Fixed handling of root incompatibilities.
+- Fixed an error where packages from custom repositories would not be found.
 
 
 ## [0.10.3] - 2018-06-04

poetry/repositories/pool.py

@@ -63,7 +63,11 @@ class Pool(BaseRepository):
 
     def package(self, name, version, extras=None):
         for repository in self._repositories:
-            package = repository.package(name, version, extras=extras)
+            try:
+                package = repository.package(name, version, extras=extras)
+            except ValueError:
+                continue
+
             if package:
                 self._packages.append(package)