RFR: Fix problem with specifying a single issue with shorthand syntax

[Robin Westberg]

Hi all,

Please review this small change that fixes a problem with specifying a single issue to the `/issues` (or `/solves`)
command using the shorthand syntax.

Best regards,
Robin

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Commit messages:
 - Fix problem with specifying a single issue with shorthand syntax

Changes: https://git.openjdk.java.net/skara/pull/592/files
 Webrev: https://webrevs.openjdk.java.net/skara/592/webrev.00
  Stats: 14 lines in 2 files changed: 12 ins; 2 del; 0 mod
  Patch: https://git.openjdk.java.net/skara/pull/592.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/592/head:pull/592

PR: https://git.openjdk.java.net/skara/pull/592