Merge branch 'refactor-errors' into dev

Author: dimitri-yatsenko

datajoint/errors.py

@@ -14,7 +14,7 @@ def suggest(self, *args):
         :param args: addition arguments
         :return: a new exception of the same type with the additional arguments
         """
-        return self.__class__(*self.args, *args)
+        return self.__class__(*(self.args + args))
 
 
 # --- Second Level ---

tests/__init__.py

@@ -116,7 +116,7 @@ def setup_package():
     db_name = "djtest_blob_migrate"
     db_file = "v0_11.sql"
     conn_root.query("""
-        CREATE DATABASE {};
+        CREATE DATABASE IF NOT EXISTS {};
         """.format(db_name))
 
     statements = parse_sql('{}/{}'.format(source, db_file))