Callum Moffat 7daf5e001c Fix crash getting spell-check suggestions (flutter/engine#42466)
On some Samsung devices Flutter with spell-check enabled will crash when typing/moving near the ">" character. 

Stack trace is

```
Fatal Exception: java.lang.NullPointerException: Attempt to invoke virtual method 'int android.view.textservice.SentenceSuggestionsInfo.getSuggestionsCount()' on a null object reference
       at io.flutter.plugin.editing.SpellCheckPlugin.onGetSentenceSuggestions(SpellCheckPlugin.java:26)
       at android.view.textservice.SpellCheckerSession.lambda$handleOnGetSentenceSuggestionsMultiple$1$android-view-textservice-SpellCheckerSession(SpellCheckerSession.java:224)
       at android.view.textservice.SpellCheckerSession$$ExternalSyntheticLambda0.run(:4)
       at android.os.Handler.handleCallback(Handler.java:942)
       at android.os.Handler.dispatchMessage(Handler.java:99)
       at android.os.Looper.loopOnce(Looper.java:226)
       at android.os.Looper.loop(Looper.java:313)
       at android.app.ActivityThread.main(ActivityThread.java:8747)
       at java.lang.reflect.Method.invoke(Method.java)
       at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:571)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1067)
```
2023-06-01 19:37:16 +00:00
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