fixup! build: don't clean obj.target directory if it doesn't exist

Author: joyeecheung

Makefile

@@ -241,8 +241,10 @@ coverage-clean:
 	$(RM) -r node_modules
 	$(RM) -r gcovr
 	$(RM) -r coverage/tmp
-	$(FIND) out/$(BUILDTYPE)/obj.target \( -name "*.gcda" -o -name "*.gcno" \) \
-		-type f -exec $(RM) {} \;
+	@if [ -d "out/Release/obj.target" ]; then \
+		$(FIND) out/$(BUILDTYPE)/obj.target \( -name "*.gcda" -o -name "*.gcno" \) \
+			-type f -exec $(RM) {};\
+	fi
 
 .PHONY: coverage
 # Build and test with code coverage reporting. HTML coverage reports will be