Slightly refactor code for better readability

Author: cmaglie

commands/service_compile.go

@@ -90,11 +90,6 @@ func (s *arduinoCoreServerImpl) Compile(req *rpc.CompileRequest, stream rpc.Ardu
 		return &cmderrors.InstanceNeedsReinitialization{}
 	}
 
-	lm, err := instances.GetLibraryManager(req.GetInstance())
-	if err != nil {
-		return err
-	}
-
 	logrus.Tracef("Compile %s for %s started", req.GetSketchPath(), req.GetFqbn())
 	if req.GetSketchPath() == "" {
 		return &cmderrors.MissingSketchPathError{}
@@ -220,7 +215,9 @@ func (s *arduinoCoreServerImpl) Compile(req *rpc.CompileRequest, stream rpc.Ardu
 	}
 
 	var libsManager *librariesmanager.LibrariesManager
-	if pme.GetProfile() != nil {
+	if lm, err := instances.GetLibraryManager(req.GetInstance()); err != nil {
+		return err
+	} else if pme.GetProfile() != nil {
 		libsManager = lm
 	}