Added check for project color non-existant

Author: HacDan

add_project.go

@@ -16,7 +16,10 @@ func AddProject(c *cli.Context) error {
 	}
 
 	project.Name = c.Args().First()
-	project.Color = c.String("color")
+
+	if c.String("color") != "0" {
+		project.Color = c.String("color")
+	}
 	project.ItemOrder = c.Int("item-order")
 
 	if err := client.AddProject(context.Background(), project); err != nil {