[FIX] core: no warning in Graph for imported modules

Before this PR, after having imported a module, a warning appears in the
log, because it tries to update the graph which does not make sense for
an imported module.
This commit makes sure the warning is skipped if the module was
imported.

closes odoo/odoo#155096

Signed-off-by: Christophe Simonis (chs) <chs@odoo.com>

odoo/modules/graph.py

@@ -3,6 +3,7 @@
 
 """ Modules dependency graph. """
 
+import functools
 import itertools
 import logging
 
@@ -11,6 +12,15 @@ import odoo.tools as tools
 
 _logger = logging.getLogger(__name__)
 
+
+@functools.lru_cache(maxsize=1)
+def _ignored_modules(cr):
+    result = ['studio_customization']
+    if tools.sql.column_exists(cr, 'ir_module_module', 'imported'):
+        cr.execute('SELECT name FROM ir_module_module WHERE imported')
+        result += [m[0] for m in cr.fetchall()]
+    return result
+
 class Graph(dict):
     """ Modules dependency graph.
 
@@ -61,7 +71,7 @@ class Graph(dict):
             info = odoo.modules.module.get_manifest(module)
             if info and info['installable']:
                 packages.append((module, info)) # TODO directly a dict, like in get_modules_with_version
-            elif module != 'studio_customization':
+            elif module not in _ignored_modules(cr):
                 _logger.warning('module %s: not installable, skipped', module)
 
         dependencies = dict([(p, info['depends']) for p, info in packages])