OO-1314: gracefully survive the scaling of a none existing image, show a...

OO-1314: gracefully survive the scaling of a none existing image, show a warning with a message if the scaling of the image is not successful

src/main/java/org/olat/core/commons/services/image/spi/ImageHelperImpl.java

@@ -247,6 +247,9 @@ public class ImageHelperImpl extends AbstractImageHelper {
 	 */
 	private ImageInputStream getInputStream(VFSLeaf leaf)
 	throws IOException {
+		if(leaf == null) {
+			return null;
+		}
 		if(leaf instanceof LocalFileImpl) {
 			LocalFileImpl file = (LocalFileImpl)leaf;
 			if(file.getBasefile() != null) {

src/main/java/org/olat/repository/_i18n/LocalStrings_de.properties

@@ -209,6 +209,8 @@ cif.error.description.empty=Bitte f\u00FCllen Sie das Feld "Beschreibung" aus.
 cif.error.displayname.empty=Bitte f\u00FCllen Sie das Feld "Titel der Lernressource" aus.
 cif.error.idnotint=Diese Identifikationsnummer existiert nicht.
 cif.error.resourcename.empty=Bitte f\u00FCllen Sie das Feld "Referenz" aus.
+cif.error.image=Das Titelbild knnte nicht richtig gespeichert werden.
+cif.error.movie=Der Teaser-Film knnte nicht richtig gespeichert werden.
 cif.expenditureOfWork=Zeitaufwand
 cif.externalid=Extern ID
 cif.externalref=Kennzeichen

src/main/java/org/olat/repository/ui/author/RepositoryEditDescriptionController.java

@@ -466,7 +466,7 @@ public class RepositoryEditDescriptionController extends FormBasicController {
 			VFSLeaf newFile = fileUpload.moveUploadFileTo(container);//give it it's real name and extension
 			boolean ok = repositoryManager.setImage(newFile, repositoryEntry);
 			if (!ok) {
-				showError("Failed");
+				showWarning("cif.error.image");
 			} else {
 				VFSLeaf image = repositoryManager.getImage(repositoryEntry);
 				if(image instanceof  LocalFileImpl) {
@@ -481,7 +481,7 @@ public class RepositoryEditDescriptionController extends FormBasicController {
 			VFSContainer m = (VFSContainer)mediaContainer.resolve("media");
 			VFSLeaf newFile = movieUpload.moveUploadFileTo(m);
 			if (newFile == null) {
-				showError("Failed");
+				showWarning("cif.error.movie");
 			} else {
 				String filename = movieUpload.getUploadFileName();
 				String extension = FileUtils.getFileSuffix(filename);