add debug log

Author: lakhansamani

server/handlers/oauth_callback.go

@@ -112,7 +112,8 @@ func OAuthCallbackHandler() gin.HandlerFunc {
 			ctx.JSON(400, gin.H{"error": err.Error()})
 			return
 		}
-		if user == nil{
+		if user == nil {
+			log.Debug("User is nil")
 			ctx.JSON(
 				500,
 				gin.H{"error": "Something Went Wrong. Please Try Again."},