[Rpm-maint] [rpm-software-management/rpm] A Segmentation fault occurred when exec rpm -ivh (#1636)

[gaoyi1988]

The context of segmentation happened is
```
		/* Get priority of trigger from header */
		trigH = rpmdbGetHeaderAt(rpmtsGetRdb(ts), offset);
		headerGet(trigH, priorityTag, &priorities, HEADERGET_MINMEM);
		rpmtdSetIndex(&priorities, tix);
		priority = *rpmtdGetUint32(&priorities);
		headerFree(trigH);
```
The priorityTag is RPMTAG_TRANSFILETRIGGERPRIORITIES.
The direct reason is priorities->type is 0, and rpmtdGetUint32() return NULL.

It seems that in call trace headerGet() -> intGetTdEntry()-> findEntry(), findEntry() return NULL. What causes this?



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