Allow 425 as a valid state, it means the file is still in postprocessing

in ownCloud Infinite Scale, files might be in that state if
postprocessing is still ongoing. All metadata are available anyway

backend/webdav/api/types.go

@@ -96,6 +96,10 @@ func (p *Prop) StatusOK() bool {
 	if err != nil {
 		return false
 	}
+	// allow status 425 "too early" for files still in postprocessing
+	if code == 425 {
+		return true
+	}
 	if code >= 200 && code < 300 {
 		return true
 	}