Added silentsend with message case to pcoin.cpp

I don't know how I missed this, because I remember coming across this deficiency before.
I had missed a case, where silentsend is requested but with a message. Previously, it would
fail without any message to stdout or stderr (only a return code).

Now, silentsend with a message works even on pcoin.cpp (tcoin.cpp already had this change).

1 files changed, 0 insertions, 0 deletions

diff --git a/pcoin.cpp b/pcoin.cpp
index e9f563b..61a7945 100644
--- a/pcoin.cpp
+++ b/pcoin.cpp