fix bug found by UT

Author: Piasy

buildSrc/src/main/kotlin/Constants.kt

@@ -1,7 +1,7 @@
 object Consts {
   const val releaseGroup = "com.piasy"
   const val releaseName = "kmp-socketio"
-  const val releaseVersion = "1.1.2"
+  const val releaseVersion = "1.1.3"
 
   val androidNS = "$releaseGroup.${releaseName.replace('-', '.')}"
 }

kmp-socketio/src/commonMain/kotlin/com/piasy/kmp/socketio/socketio/Socket.kt

@@ -301,8 +301,10 @@ class Socket(
         recvBuffer.forEach { fireEvent(it) }
         recvBuffer.clear()
 
-        io.packets(sendBuffer)
-        sendBuffer.clear()
+        if (sendBuffer.isNotEmpty()) {
+            io.packets(sendBuffer)
+            sendBuffer.clear()
+        }
 
         super.emit(EVENT_CONNECT)
     }

kmp-socketio/src/jvmTest/kotlin/com/piasy/kmp/socketio/engineio/transports/PollingXHRTest.kt

@@ -252,7 +252,7 @@ class PollingXHRTest : BaseTest() {
         waitExec(this)
         polling.polling.close()
         waitExec(this)
-        waitExec(this, 2500)
+        waitExec(this, 5000)
 
         coVerify(exactly = 3) { polling.factory.httpRequest(any(), any()) }
         Logging.info("XXPXX", "closeOpening verify events")