Make sure the grep command always returns success

Author: Caspar van Leeuwen

EESSI-install-software.sh

@@ -370,7 +370,7 @@ fi
 # use PR patch file to determine in which easystack files stuff was added
 # Note that we exclude the scripts/gpu_support/ dir, since those are not meant to be built in the
 # software-layer, but they are helper easystacks for installing e.g. CUDA in host_injections
-changed_easystacks=$(cat ${pr_diff} | grep '^+++' | cut -f2 -d' ' | sed 's@^[a-z]/@@g' | grep 'easystacks/.*yml$' | egrep -v 'known-issues|missing' | grep -v "scripts/gpu_support/") 
+changed_easystacks=$(cat ${pr_diff} | grep '^+++' | cut -f2 -d' ' | sed 's@^[a-z]/@@g' | grep 'easystacks/.*yml$' | egrep -v 'known-issues|missing' | (grep -v "scripts/gpu_support/" || true)) 
 if [ -z "${changed_easystacks}" ]; then
     echo "No missing installations, party time!"  # Ensure the bot report success, as there was nothing to be build here
 else