data: Fix output inconsistencies for emit_var

VAL = ""     (not shown)
VAL = " "    (shown as "")
VAL = " x"   (shown as "x")

would all show up rather differently to what would be expected in the
bitbake -e output. This fixes things so they appear consistently.

The output for running some shell functions may also change slightly
but shouldn't change in a way that is likely to cause problems.

[YOCTO #5507]

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
bitbake: fetch2: Remove the unused urldata from the git fetcher.

Signed-off-by: Florin Sarbu <florin.sarbu@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>