SWTException occurs always on opening gfxtrace file

**Environment information:**
- AGI version: 3.3.1
- Host OS: Windows
If tracing on Android:
- Device model: private
- Android Version: 13

**Bug description**
A clear and concise description of what the bug is.
SWTException occurs always on opening gfxtrace file

**Reproduction steps**
Steps to reproduce the behavior:
Just opened gfxtrace file and the error occurred.

**Stacktrace**
Please paste a stacktrace here if it's available.
```
org.eclipse.swt.SWTException: Failed to execute runnable (java.lang.reflect.UndeclaredThrowableException)
at org.eclipse.swt.SWT.error(SWT.java:4918)
at org.eclipse.swt.SWT.error(SWT.java:4833)
at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:135)
at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4043)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3648)
at org.eclipse.jface.window.Window.runEventLoop(Window.java:823)
at org.eclipse.jface.window.Window.open(Window.java:799)
at com.google.gapid.Main$UI.show(Main.java:140)
at com.google.gapid.Main.main(Main.java:80)
Caused by: java.lang.reflect.UndeclaredThrowableException
at com.sun.proxy.$Proxy9.onCommandsLoaded(Unknown Source)
at com.google.gapid.models.CommandStream.fireLoadedEvent(CommandStream.java:181)
at com.google.gapid.models.ModelBase.updateError(ModelBase.java:120)
at com.google.gapid.models.ModelBase$1.onUiThreadError(ModelBase.java:85)
at com.google.gapid.rpc.UiErrorCallback.onUiThread(UiErrorCallback.java:36)
at com.google.gapid.rpc.UiErrorCallback.onUiThread(UiErrorCallback.java:25)
at com.google.gapid.rpc.UiCallback.lambda$onFinish$0(UiCallback.java:46)
at com.google.gapid.widgets.Widgets.ifNotDisposed(Widgets.java:141)
at com.google.gapid.widgets.Widgets.lambda$scheduleIfNotDisposed$1(Widgets.java:169)
at com.google.gapid.widgets.Widgets.lambda$schedule$0(Widgets.java:161)
at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:40)
at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:132)
... 6 more
Caused by: java.lang.reflect.InvocationTargetException
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.base/java.lang.reflect.Method.invoke(Unknown Source)
at com.google.gapid.util.Events$ListenerCollectionImpl.invoke(Events.java:167)
... 18 more
Caused by: java.lang.NullPointerException
at com.google.gapid.views.CommandTree$TreeState.expandChildren(CommandTree.java:1363)
at com.google.gapid.views.CommandTree$TreeState.reset(CommandTree.java:1295)
at com.google.gapid.views.CommandTree.onCommandsLoaded(CommandTree.java:542)
... 23 more
```
**Screenshots**
If applicable, add screenshots to help explain your problem.

**Additional debugging information**
- Please attach the generated _gapis.log_ and _gapic.log_ files you will find in the temp folder (e.g. /tmp/ on linux).
- If using Android: Please attach a full logcat dump (```adb logcat -d > logcat-full.txt```) that contains logs since AGI was started.