Find breaks on "disabled" property

The exception was raised during unwrap_from_path() call.

* tiramisu/config.py (_filter_by_attrs): do not catch exception arround
  getattr().
  (_find): continue to next option if unwrap_from_path() raise
  PropertiesOptionError.

Fixes: #4728 @5m

tiramisu/config.py

@@ -556,11 +556,8 @@ class Config(object):
                 if not hasattr(option, key):
                     return False
                 else:
-                    try:
                     if getattr(option, key) != value:
                         return False
-                    except:
-                        pass # a property restricts the access of the value
                     else:
                         continue
             return True
@@ -592,7 +589,10 @@ class Config(object):
         find_results = []
         paths = self.getpaths(allpaths=True)
         for path in paths:
+            try:
                 option = self.unwrap_from_path(path)
+            except PropertiesOptionError, err:
+                continue
             if not _filter_by_name():
                 continue
             if not _filter_by_value():