webservices: Write empty prefix if "prefix" is NULL and "ns" is empty.

[Owen Rudge]

Signed-off-by: Owen Rudge <orudge at codeweavers.com>
---
  dlls/webservices/tests/writer.c | 22 ++++++++++++++++++++++
  dlls/webservices/writer.c       |  5 ++---
  2 files changed, 24 insertions(+), 3 deletions(-)


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