SDS011read.cpp: bugfix conditional compile

src/sds011read.cpp

@@ -3,15 +3,19 @@
 // Local logging tag
 static const char TAG[] = __FILE__;
 
+#if (HAS_SDS)
+
 #include "sds011read.h"
 
 // UART(2) is unused in this project
 #if (HAS_IF482)
 #error cannot use IF482 together with SDS011 (both use UART#2)
 #endif
+
 #ifndef SDS011_SERIAL
 #error serial settings for SDS011 connection missing
 #endif
+
 static HardwareSerial sdsSerial(2); // so we use it here
 static SDS011 sdsSensor;            // fine dust sensor
 
@@ -58,3 +62,5 @@ void sds011_wakeup() {
     isSDS011Active = true;
   }
 }
+
+#endif // HAS_SDS