added missing "oracle" in adapters.register_for()
Fixes web2py/web2py#1599
@@ -5,7 +5,7 @@ from ..helpers.classes import Reference
from .base import SQLAdapter
from . import adapters, with_connection_or_raise
-@adapters.register_for('')
+@adapters.register_for('oracle')
class Oracle(SQLAdapter):
dbengine = 'oracle'
drivers = ('cx_Oracle',)
