build-update-package: Added check to verify the existence of .md5sum dir

Exit on error 5, in case there is no .md5sum directory.

Signed-off-by: Erik Alexandre Pucci <eap08@c3sl.ufpr.br>
Acked-by: Adriano da Luz <al08@c3sl.ufpr.br>
Acked-by: Josiney de Souza <josineys@c3sl.ufpr.br>

build-update-package

@@ -71,6 +71,12 @@ cd "${AGENTDIR}"
 # Check all MD5 files
 printf "Checking SEED2-run files integrity... "
 
+if ! test -d "${MD5DIR}"; then
+    printf "ERROR (5): There is no MD5 directory. Please, run create %b"
+           "integrity.\n"
+    exit 5
+fi
+
 for FILE in $(find "${MD5DIR}" -type f); do
     if ! check_file_integrity "${FILE}"; then
         printf "ERROR (3): File(s) corrupted. Please, re-create integrity or %b"