librariesindex: Fix nil pointer. Refs #1176

Let the library index return the latest known version,
if a library without a version is updated.

Signed-off-by: Ruben Jenster <[email protected]>

Author: r10r

arduino/libraries/librariesindex/index.go

@@ -136,7 +136,7 @@ func (idx *Index) FindLibraryUpdate(lib *libraries.Library) *Release {
 	if indexLib == nil {
 		return nil
 	}
-	if indexLib.Latest.Version.GreaterThan(lib.Version) {
+	if lib.Version == nil || indexLib.Latest.Version.GreaterThan(lib.Version) {
 		return indexLib.Latest
 	}
 	return nil

arduino/libraries/librariesindex/index_test.go

@@ -78,6 +78,10 @@ func TestIndexer(t *testing.T) {
 	require.NotNil(t, rtcUpdate)
 	require.Equal(t, "[email protected]", rtcUpdate.String())
 
+	rtcUpdateNoVersion := index.FindLibraryUpdate(&libraries.Library{Name: "RTCZero", Version: nil})
+	require.NotNil(t, rtcUpdateNoVersion)
+	require.Equal(t, "[email protected]", rtcUpdateNoVersion.String())
+
 	rtcNoUpdate := index.FindLibraryUpdate(&libraries.Library{Name: "RTCZero", Version: semver.MustParse("3.0.0")})
 	require.Nil(t, rtcNoUpdate)