Workaround pattern for empty function array.

src/main/target/OMNIBUSF7/config.c

@@ -32,6 +32,8 @@ static targetSerialPortFunction_t targetSerialPortFunction[] = {
 #if defined(OMNIBUSF7V2) && defined(ESC_SENSOR_UART)
     // OMNIBUS F7 V2 has an option to connect UART7_RX to ESC telemetry
     { ESC_SENSOR_UART, FUNCTION_ESC_SENSOR },
+#else
+    { SERIAL_PORT_NONE, FUNCTION_NONE },
 #endif
 };