Check for a valid name

src/freedombone-config

@@ -1104,7 +1104,8 @@ function interactive_configuration {
     fi
 
     if [[ $SYSTEM_TYPE != "$VARIANT_MESH" ]]; then
-        while [ ! $MY_NAME ]
+        valid_name=
+        while [ ! $valid_name ]
         do
             data=$(tempfile 2>/dev/null)
             trap "rm -f $data" 0 1 2 5 15
@@ -1112,7 +1113,14 @@ function interactive_configuration {
                    --inputbox $"Your full name (or nick)" 10 30 "$(grep 'MY_NAME' temp.cfg | awk -F '=' '{print $2}')" 2> $data
             sel=$?
             case $sel in
-                0) MY_NAME=$(cat $data);;
+                0)  possible_name=$(cat $data)
+                    if [ "$possible_name" ]; then
+                        if [ ${#possible_name} -gt 1 ]; then
+                            valid_name="$possible_name"
+                            MY_NAME="$possible_name"
+                        fi
+                    fi
+                    ;;
                 1) exit 1;;
                 255) exit 1;;
             esac