[FIX] pad: prevent concat bool and string
[FIX] pad: prevent concat bool and string

Before installing pads, create a second company
On the first company, create a task and initialize its pad

Switch companies and try to edit the task

Before this commit:
There is a traceback because since the pad credentials of the second company are not set,
the url cannot be computed

After this commit, we prevent the Null field to concat with a string
hence there is no traceback

OPW 1837059
closes #24263

ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo