Use-of-uninitialized-value in SfxEntry::test_condition
OSS-Fuzz report:
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=51218
```
Crash type: Use-of-uninitialized-value
Crash state:
SfxEntry::test_condition
SfxEntry::add
AffixMgr::expand_rootword
```