fixed problem with zim importer which crashed when non-valid urls appeared

source/net/yacy/document/importer/ZimImporter.java

@@ -108,6 +108,7 @@ public class ZimImporter extends Thread implements Importer {
 
             // read all documents
             for (int i = 0; i < this.file.header_entryCount; i++) {
+            	try {
 	                if (this.abort) break;
 	                DirectoryEntry de = this.reader.getDirectoryInfo(i);
 	                if (!(de instanceof ZIMReader.ArticleEntry)) continue;
@@ -160,6 +161,10 @@ public class ZimImporter extends Thread implements Importer {
 	                String error = sb.toIndexer(response);
 	                if (error != null) ConcurrentLog.info("ZimImporter", "error parsing: " + error);
 	                this.recordCnt++;
+            	} catch (Exception e) {
+            		// catch any error that could stop the importer
+	                ConcurrentLog.info("ZimImporter", "error loading: " + e.getMessage());
+            	}
             }
         } catch (IOException e) {
             ConcurrentLog.info("ZimImporter", "error reading: " + e.getMessage());