[tools/parser] Refactor InvalidVersion message

When failing trying to open an old odML version
file advertise the VersionConverter to import
the file instead in the Exception message.

Author: mpsonntag

odml/tools/dict_parser.py

@@ -131,9 +131,9 @@ def to_odml(self, parsed_doc):
             raise ParserException("Invalid odML document: Could not find odml-version.")
 
         elif self.parsed_doc.get('odml-version') != FORMAT_VERSION:
-            msg = ("Cannot read file: invalid odML document format version '%s'. \n"
-                   "This package supports odML format versions: '%s'."
-                   % (self.parsed_doc.get('odml-version'), FORMAT_VERSION))
+            msg = ("Cannot parse odML document with format version '%s'. \n"
+                   "\tUse the 'tools.VersionConverter' to import previous odML formats."
+                   % self.parsed_doc.get('odml-version'))
             raise InvalidVersionException(msg)
 
         self.parsed_doc = self.parsed_doc['Document']

odml/tools/xmlparser.py

@@ -159,9 +159,9 @@ def _handle_version(root):
             raise ParserException("Could not find format version attribute "
                                   "in <odML> tag.\n")
         elif root.attrib['version'] != FORMAT_VERSION:
-            msg = ("Cannot read file: invalid odML document format version '%s'. \n"
-                   "This package supports odML format versions: '%s'."
-                   % (root.attrib['version'], FORMAT_VERSION))
+            msg = ("Cannot parse odML document with format version '%s'. \n"
+                   "\tUse the 'tools.VersionConverter' to import previous odML formats."
+                   % root.attrib['version'])
             raise InvalidVersionException(msg)
 
     def from_file(self, xml_file):