[parrot/parrot] 4268b4: don't return NULL from STRING* vtable functions, u...

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  Branch: refs/heads/master
  Home:   https://github.com/parrot/parrot

  Commit: 4268b4cdc4eb5324900eb369320037c773746e7a
      https://github.com/parrot/parrot/commit/4268b4cdc4eb5324900eb369320037c773746e7a
  Author: NotFound <julian.notfound at gmail.com>
  Date:   2011-11-08 (Tue, 08 Nov 2011)

  Changed paths:
    M src/pmc/callcontext.pmc

  Log Message:
  -----------
  don't return NULL from STRING* vtable functions, use STRINGNULL
In some cases we should throw instead, but this fix avoids segfaults and
pass all tests, enough for a now