sqlalchemy: fix default integer constructor

* Addresses issue with default constructor on types that do not
  accept arguments in SQLAlchemy>=0.9. (closes #1776)

Signed-off-by: Leonardo Rossi <leonardo.r@cern.ch>
1: D400 First line should end with '.', not 'y'
1: D205 Blank line missing between one-line summary and description
1: D208 Docstring is over-indented
111: D103 Docstring missing
115:1: F999 redefinition of unused 'compile_text' from line 109
116: D103 Docstring missing
120: D101 Docstring missing
121: D102 Docstring missing
124: D102 Docstring missing
131: D401 First line should be imperative: 'Call', not 'Calls'
131: D400 First line should end with '.', not '5'
145: D203 Expected 1 blank line *before* class docstring, found 0
150: D102 Docstring missing
162: D102 Docstring missing
170: D102 Docstring missing
176: D401 First line should be imperative: 'Thi', not 'This'
176: D200 One-line docstring should not occupy 3 lines