Fix extract_utils when not using blob sections

"$3" evaluates as "" when $3 is empty, and so $# is still 3
When $3 is empty, do not use it

Change-Id: I87df7dd8ed23cac3d4cff16dce0996bbe0a3e6cc
1 file changed
tree: 1508111e32192450733ecf55ecc5b3a05a8a710f
  1. templates/
  2. extract_utils.sh
  3. sdat2img.py