[Rpm-maint] [rpm-software-management/rpm] Fix IMA signature fubar, take III (#1833, RhBug:2018937) (PR #1914)

[Michael Schroeder]

But now you'll get a NULL return value for empty signatures, because `signature` is only set if `off` is not zero.

Can't you do the special casing in the lookup instead? I.e.:
```
uint32_t off = fi->signatureoffs[ix];
size_t slen = fi->signatureoffs[ix + 1] - off;
if (!slen)
    off = 0;    /* return special block of zeros for empty signatures */
```

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