cli/context/store: List(): don't interrupt listing for not-found errors

There's no reason to stop listing contexts if a context does not exist
while iterating over the directories,

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

Author: thaJeztah

cli/context/store/metadatastore.go

@@ -110,6 +110,9 @@ func (s *metadataStore) list() ([]Metadata, error) {
 	for _, dir := range ctxDirs {
 		c, err := s.getByID(contextdir(dir))
 		if err != nil {
+			if os.IsNotExist(err) {
+				continue
+			}
 			return nil, err
 		}
 		res = append(res, c)