fix hanatool

hanatool.sh

@@ -1,5 +1,5 @@
 #!/bin/bash
-# Version: 1.4.1
+# Version: 1.4.2
 # ==============================================================================
 # SAP HANA Schema and Tenant Management Tool (hanatool.sh)
 #
@@ -143,8 +143,8 @@ case "$ACTION" in
         echo "   - Compress:   ${COMPRESS}"
 
         timestamp=$(date +%Y%m%d_%H%M%S)
-        local backup_target_dir
-        local backup_path_prefix
+        backup_target_dir=""
+        backup_path_prefix=""
         
         if [[ "$COMPRESS" == "true" ]]; then
             if [[ "$DRY_RUN" == "true" ]]; then