Include trailing {}s in raw latex commands.

Change is in rawLaTeXInline in LaTeX reader, but
it affects the markdown reader and other readers
that allow raw LaTeX.

Previously, trailing `{}` would be included for
unknown commands, but not for known commands.
However, they are sometimes used to avoid a trailing
space after the command.  The chances that a `{}`
after a LaTeX command is not part of the command
are very small.

Closes #5439.

1 files changed, 6 insertions, 0 deletions

diff --git a/test/command/5439.md b/test/command/5439.md
new file mode 100644
index 000000000..b021161fd
--- /dev/null
+++ b/test/command/5439.md
@@ -0,0 +1,6 @@
+```
+% pandoc -t latex
+namespace\fshyp{}container
+^D
+namespace\fshyp{}container
+```