changed missing file error to warning for lookups (#16800)

* changed missing file error to warning for lookups

* changed plugins that expected exception

warning will still be displayed, they now work with None value

lib/ansible/plugins/lookup/__init__.py

@@ -22,7 +22,6 @@ __metaclass__ = type
 from abc import ABCMeta, abstractmethod
 
 from ansible.compat.six import with_metaclass
-from ansible.errors import AnsibleFileNotFound
 
 try:
     from __main__ import display
@@ -115,6 +114,6 @@ class LookupBase(with_metaclass(ABCMeta, object)):
 
         result = self._loader.path_dwim_relative_stack(paths, subdir, needle)
         if result is None:
-            raise AnsibleFileNotFound("Unable to find '%s' in expected paths." % needle)
+            self._display.warning("Unable to find '%s' in expected paths." % needle)
 
         return result

lib/ansible/plugins/lookup/fileglob.py

@@ -32,10 +32,7 @@ class LookupModule(LookupBase):
         ret = []
         for term in terms:
             term_file = os.path.basename(term)
-            try:
             dwimmed_path = self.find_file_in_search_path(variables, 'files', os.path.dirname(term))
-            except AnsibleFileNotFound:
-                dwimmed_path = None
             if dwimmed_path:
                 globbed = glob.glob(to_bytes(os.path.join(dwimmed_path, term_file), errors='surrogate_or_strict'))
                 ret.extend(to_text(g, errors='surrogate_or_strict') for g in globbed if os.path.isfile(g))

lib/ansible/plugins/lookup/first_found.py

@@ -181,11 +181,9 @@ class LookupModule(LookupBase):
              # get subdir if set by task executor, default to files otherwise
             subdir = getattr(self, '_subdir', 'files')
             path = None
-            try:
             path = self.find_file_in_search_path(variables, subdir, fn)
+            if path is not None:
                 return [path]
-            except AnsibleFileNotFound:
-                continue
         else:
             if skip:
                 return []