Backend: Return error if no main file for indexing was found #379 #357

Signed-off-by: Michael Mayer <michael@liquidbytes.net>

internal/photoprism/mediafile.go

@@ -288,8 +288,12 @@ func (m *MediaFile) RelatedFiles(stripSequence bool) (result RelatedFiles, err e
 		result.Files = append(result.Files, resultFile)
 	}
 
+	if result.Main == nil {
+		return result, fmt.Errorf("no main file found for %s", txt.Quote(m.BaseName()))
+	}
+
 	// Add hidden JPEG if exists.
-	if !result.ContainsJpeg() && result.Main != nil {
+	if !result.ContainsJpeg() {
 		if jpegName := fs.TypeJpeg.FindFirst(result.Main.FileName(), []string{Config().SidecarPath(), fs.HiddenPath}, Config().OriginalsPath(), stripSequence); jpegName != "" {
 			if resultFile, err := NewMediaFile(jpegName); err == nil {
 				result.Files = append(result.Files, resultFile)

internal/photoprism/related.go

@@ -8,15 +8,15 @@ type RelatedFiles struct {
 
 // ContainsJpeg returns true if related file list contains a JPEG.
 func (rf RelatedFiles) ContainsJpeg() bool {
-	if rf.Main.IsJpeg() {
-		return true
-	}
-
 	for _, f := range rf.Files {
 		if f.IsJpeg() {
 			return true
 		}
 	}
 
-	return false
+	if rf.Main == nil {
+		return false
+	}
+
+	return rf.Main.IsJpeg()
 }