Add picture bIsComplete flag to reflect the status of decoder

Modify the output error status and add some some judgement

codec/decoder/core/src/decoder.cpp

@@ -297,7 +297,6 @@ int32_t WelsOpenDecoder (PWelsDecoderContext pCtx) {
   pCtx->bReferenceLostAtT0Flag	= true;	// should be true to waiting IDR at incoming AU bits following, 6/4/2010
 #endif //LONG_TERM_REF
   pCtx->bNewSeqBegin = true;
-  pCtx->bDecErrorConedFlag = false; //default: decoder normal status
   pCtx->bPrintFrameErrorTraceFlag = true;
   pCtx->iIgnoredErrorInfoPacketCount = 0;
   return iRet;