!1513 dts: fix error when execute dynamic model

From: @zhengyuanhua
Reviewed-by: @xchu42,@wqtshg
Signed-off-by: @ji_chen

ge/graph/manager/graph_mem_allocator.h

@@ -226,7 +226,7 @@ class MemManager {
 
     // Usually impossible
     if (allocator == nullptr) {
-      GELOGE(ge::INTERNAL_ERROR, "Get allocator failed, memory type is %u.", memory_type);
+      GELOGW("Get allocator failed, memory type is %u.", memory_type);
       static T default_allocator(RT_MEMORY_RESERVED);
       return default_allocator;
     }

ge/single_op/single_op_manager.cc

@@ -67,6 +67,7 @@ FMK_FUNC_HOST_VISIBILITY FMK_FUNC_DEV_VISIBILITY Status SingleOpManager::Release
   std::lock_guard<std::mutex> lock(mutex_);
   auto it = stream_resources_.find(resource_id);
   if (it == stream_resources_.end()) {
+    MemManager::Instance().CachingInstance(RT_MEMORY_HBM).TryFreeBlocks();
     return SUCCESS;
   }
   delete it->second;