Simplify the babi_multiprocess.diff by capturing exceptions when obtaining babi

models directy from the pool.

Capturing only on RPC requests was not enough because an RPC request to read
keywords, or attachments, for example, could lead to those models to try to
access the model which was not yet added to the pool.

That happened with keywords and attachments which have a reference field but
also trying to access the chart wizard if the server was reloaded while the
user had the tree view already loaded. Most probably other places suffered from
the same problem.

babi_multiprocess.diff

@@ -1,41 +1,16 @@
- diff -r cc988ec8da34 trytond/trytond/protocols/dispatcher.py
- --- a/trytond/trytond/protocols/dispatcher.py   Mon Apr 23 17:12:37 2018 +0200
- +++ b/trytond/trytond/protocols/dispatcher.py   Fri May 11 12:53:17 2018 +0200
- @@ -122,8 +122,19 @@
-      type, _ = method.split('.', 1)
-      name = '.'.join(method.split('.')[1:-1])
-      method = method.split('.')[-1]
- -    return pool.get(name, type=type), method
- -
- +    try:
- +        obj = pool.get(name, type=type)
- +    except KeyError:
- +        if name[:15] == 'babi_execution_':
- +            with Transaction().start(pool.database_name, request.user_id,
- +                    readonly=False):
- +                Execution = pool.get('babi.report.execution')
- +                execution = Execution(int(name[15:]))
- +                execution.validate_model(avoid_registration=True)
- +            obj = pool.get(name, type=type)
- +        else:
- +            raise
- +    return obj, method
-
-  @app.auth_required
-  @with_pool
-diff -r d875ab180d75 trytond/ir/model.py
---- a/trytond/trytond/ir/model.py       Mon May 06 14:45:35 2019 +0200
-+++ b/trytond/trytond/ir/model.py       Wed May 22 00:18:59 2019 +0200
-@@ -587,8 +587,9 @@
-             # XXX Can not check access right on instance method
-             selection = []
-             for model_name, _ in selection:
--                if model_name and not cls.check(model_name, mode=mode,
--                        raise_exception=False):
-+                if (model_name and not model_name.startswith('babi_execution_')
-+                        and not cls.check(model_name, mode=mode,
-+                            raise_exception=False)):
-                     return False
-             return True
-         else:
-
+diff -r 0bde16075654 trytond/trytond/pool.py
+--- a/trytond/trytond/pool.py   Sun Jul 28 16:05:45 2019 +0200
++++ b/trytond/trytond/pool.py   Fri Aug 16 11:13:08 2019 +0000
+@@ -183,6 +183,12 @@
+                 cls.__setup__()
+                 self.add(cls, type)
+                 return cls
++            elif name[:15] == 'babi_execution_':
++                with Transaction(new=True).start(self.database_name, 0, readonly=False):
++                    Execution = self.get('babi.report.execution')
++                    execution = Execution(int(name[15:]))
++                    execution.validate_model(avoid_registration=True)
++                return self._pool[self.database_name][type][name]
+             raise
+ 
+     def add(self, cls, type='model'):