Check config file length

src/freedombone-utils-config

@@ -127,6 +127,9 @@ function write_config_param {
     if [ ! $CONFIGURATION_FILE ]; then
         CONFIGURATION_FILE=$HOME/${PROJECT_NAME}.cfg
     fi
+    if [ ${#CONFIGURATION_FILE} -eq 0 ]; then
+        CONFIGURATION_FILE=$HOME/${PROJECT_NAME}.cfg
+    fi
 
     if [ ${#param_name} -gt 0 ]; then
         if [ ${#param_value} -gt 0 ]; then