fix:passing a null path while launching mini-program doesn't lauch the home page…

android/src/main/kotlin/com/jarvan/fluwx/handler/FluwxLaunchMiniProgramHandler.kt

 package com.jarvan.fluwx.handler
 
+import android.util.Log
 import io.flutter.plugin.common.MethodCall
 import io.flutter.plugin.common.MethodChannel
 import com.tencent.mm.opensdk.modelbiz.WXLaunchMiniProgram
@@ -11,7 +12,7 @@ internal class FluwxLaunchMiniProgramHandler {
     fun launchMiniProgram(call: MethodCall,result: MethodChannel.Result){
         val req = WXLaunchMiniProgram.Req()
         req.userName = call.argument<String?>("userName") // 填小程序原始id
-        req.path = call.argument<String?>("path")                  //拉起小程序页面的可带参路径，不填默认拉起小程序首页
+        req.path = call.argument<String?>("path")?:"" //拉起小程序页面的可带参路径，不填默认拉起小程序首页
         val type = call.argument("miniProgramType")?:0
         req.miniprogramType = when(type){
             1 -> WXLaunchMiniProgram.Req.MINIPROGRAM_TYPE_TEST