Don't bail out if trying to upload external binary

No functional modification for standard flow (compile+upload without -i flag)

Author: facchinm

Diff for: commands/upload/upload.go

@@ -208,7 +208,8 @@ func run(command *cobra.Command, args []string) {
 
 	uploadProperties.SetPath("build.path", importPath)
 	uploadProperties.Set("build.project_name", importFile)
-	if _, err := os.Stat(filepath.Join(sketch.FullPath, importFile+ext)); err != nil {
+
+	if _, err := os.Stat(filepath.Join(importPath.String(), importFile+ext)); err != nil {
 		if os.IsNotExist(err) {
 			formatter.PrintErrorMessage("Compiled sketch not found. Please compile first.")
 		} else {