Version bump to 0.9.1

- Bugfixes for spack find
- 0.9.1 can read specs from current develop.

lib/spack/spack/__init__.py

@@ -105,7 +105,7 @@
 
 # Version information
 from spack.version import Version
-spack_version = Version("0.9")
+spack_version = Version("0.9.1")
 
 #
 # Executables used by Spack

lib/spack/spack/spec.py

@@ -717,6 +717,7 @@ def from_node_dict(node):
         else:
             spec.compiler = CompilerSpec.from_dict(node)
 
+        if 'variants' in node:
             for name, enabled in node['variants'].items():
                 spec.variants[name] = VariantSpec(name, enabled)