[FIX] base: Avoid exception when showing error in namespaced qweb node

Before this commit, if a SyntaxError or any other exception occurs in a
qweb attribute, and the path to the node contains at least one
namespaced tag, e.g.:

<mynode:node xmlns:mynode="http://example.com/mynode">
    <field t-att-value="'This is a TypeError' + []"/>
</mynode:node>

the following exception is raised, instead of the actual one:
lxml.etree.XPathEvalError: Undefined namespace prefix

After this commit, if the path to the failing node contains a namespaced
tag, the node is not retrieved, to avoid the above exception, So this
one will be raised:

Error to render compiling AST
TypeError: Can't convert 'list' object to str implicitly
Template: module.template_name
Path: /templates/mynode:node/field

In addition, a test case was included, to ensure this works as expected

Closes #24824
opw-1853232

0 files changed, 0 insertions, 0 deletions