Added EmptyChangeset into VCS module

rhodecode/lib/vcs/backends/base.py

@@ -909,3 +909,48 b' class BaseInMemoryChangeset(object):'
         :raises ``CommitError``: if any error occurs while committing
         """
         raise NotImplementedError
+
+
+class EmptyChangeset(BaseChangeset):
+    """
+    An dummy empty changeset. It's possible to pass hash when creating
+    an EmptyChangeset
+    """
+
+    def __init__(self, cs='0' * 40, repo=None, requested_revision=None,
+                 alias=None):
+        self._empty_cs = cs
+        self.revision = -1
+        self.message = ''
+        self.author = ''
+        self.date = ''
+        self.repository = repo
+        self.requested_revision = requested_revision
+        self.alias = alias
+
+    @LazyProperty
+    def raw_id(self):
+        """
+        Returns raw string identifying this changeset, useful for web
+        representation.
+        """
+
+        return self._empty_cs
+
+    @LazyProperty
+    def branch(self):
+        from rhodecode.lib.vcs.backends import get_backend
+        return get_backend(self.alias).DEFAULT_BRANCH_NAME
+
+    @LazyProperty
+    def short_id(self):
+        return self.raw_id[:12]
+
+    def get_file_changeset(self, path):
+        return self
+
+    def get_file_content(self, path):
+        return u''
+
+    def get_file_size(self, path):
+        return 0
  No newline at end of file

rhodecode/lib/vcs/nodes.py

@@ -19,7 +19,7 b' from rhodecode.lib.vcs.utils.lazy import'
 from rhodecode.lib.vcs.utils import safe_unicode, safe_str
 from rhodecode.lib.vcs.exceptions import NodeError
 from rhodecode.lib.vcs.exceptions import RemovedFileNodeError
-from rhodecode.lib.utils import EmptyChangeset
+from rhodecode.lib.vcs.backends.base import EmptyChangeset
 
 
 class NodeKind: