DDNS login details

src/freedombone-config

         esac
         save_configuration_file
 
-        while [ ! $DDNS_USERNAME ]
+        valid_ddns_username=
+        while [ ! $valid_ddns_username ]
         do
             data=$(tempfile 2>/dev/null)
             trap "rm -f $data" 0 1 2 5 15
                    --inputbox $"Dynamic DNS provider username" 10 30 "$(grep 'DDNS_USERNAME' temp.cfg | awk -F '=' '{print $2}')" 2> $data
             sel=$?
             case $sel in
-                0) DDNS_USERNAME=$(cat $data);;
+                0)  possible_username=$(cat $data)
+                    if [ "$possible_username" ]; then
+                        if [ ${#possible_username} -gt 1 ]; then
+                            valid_ddns_username=$(cat $data)
+                            DDNS_USERNAME=$valid_ddns_username
+                            break;
+                        fi
+                    fi
+                    ;;
                 1) exit 1;;
                 255) exit 1;;
             esac
         done
         save_configuration_file
 
-        while [ ! $DDNS_PASSWORD ]
+        valid_ddns_password=
+        while [ ! $valid_ddns_password ]
         do
             data=$(tempfile 2>/dev/null)
             trap "rm -f $data" 0 1 2 5 15
                    --passwordbox $"Dynamic DNS provider password" 10 30 "$(grep 'DDNS_PASSWORD' temp.cfg | awk -F '=' '{print $2}')" 2> $data
             sel=$?
             case $sel in
-                0) DDNS_PASSWORD=$(cat $data);;
+                0)  possible_password=$(cat $data)
+                    if [ "$possible_password" ]; then
+                        if [ ${#possible_password} -gt 1 ]; then
+                            valid_ddns_password=$(cat $data)
+                            DDNS_PASSWORD=$valid_ddns_password
+                            break;
+                        fi
+                    fi
+                    ;;
                 1) exit 1;;
                 255) exit 1;;
             esac
                         if [ ${#possible_name} -gt 1 ]; then
                             valid_name="$possible_name"
                             MY_NAME="$possible_name"
+                            break;
                         fi
                     fi
                     ;;