Fix unbound variable errors

seqs/coturn.sh

@@ -60,7 +60,7 @@ step_10() {
   local dnsUrl="46.182.19.48" #digitalcourage.de/support/zensurfreier-dns-server
   local dnsFallbackUrl="194.150.168.168" #dns.as250.net; Berlin/Frankfurt
   local lecho="info"
-  if [ "$1" == "-l" ]; then
+  if [ "${1:-}" == "-l" ]; then
     lecho="echo"
     shift
   fi

seqs/ebackup.sh

@@ -178,8 +178,8 @@ step_7() {
 
 step_20_info() {
   shift
-  local ebuTarget=$EBU_TARGET
-  [ ! -z "$1" ] && ebuTarget="$1"
+  local ebuTarget="${EBU_TARGET:-}"
+  [ ! -z "${1:-}" ] && ebuTarget="$1"
   if contextHelp; then
     echo "Status of (profile) [TARGET]"
   elif [ ! -z "$1" ]; then

seqs/element-web.sh

@@ -24,7 +24,7 @@ step_18_alias() { echo "updatecheck"; }
 step_18() {
   shift
   local latestVersion=
-  if [ ! -z $1 ] ; then
+  if [ ! -z "${1:-}" ] ; then
     latestVersion="$1"
   else
     latestVersion=$(curl --silent "$latestUrl" | grep -Po '"tag_name": "v\K.*?(?=")')
@@ -74,7 +74,7 @@ step_20() {
 
 step_22_info() {
   shift
-  if [ -z $1 ] ; then
+  if [ -z "${1:-}" ] ; then
     echo -n "Get latest version from github"
     if ! contextHelp ; then
       echo ": $(curl --silent "$latestUrl" | grep -Po '"tag_name": "\K.*?(?=")')"
@@ -89,7 +89,7 @@ step_22_alias() { echo "upgrade"; }
 step_22() {
   shift # don't need step number
   local latestVersion=
-  if [ ! -z $1 ] ; then
+  if [ ! -z "${1:-}" ] ; then
     latestVersion="$1"
   else
     latestVersion=$(curl --silent "$latestUrl" | grep -Po '"tag_name": "v\K.*?(?=")')