Move -a processing, another shellcheck fix

abra

@@ -1,7 +1,12 @@
 #!/bin/bash
 PROGRAM_NAME=""$(basename "$0")
 
-if [ -z "$STACK_NAME" ] || [ -z "$STACK_NAME" ]; then
+if [ $1 == "-a" ]; then
+	STACK_NAME=$2
+	shift 2
+fi
+
+if [ -z "$STACK_NAME" ]; then
 	echo "$(tput setaf 1)ERROR: \$STACK_NAME must be set (e.g. export STACK_NAME=my_cool_app)$(tput sgr0 )"
 	exit
 fi
@@ -93,11 +98,6 @@ sub_logs (){
 		--timestamps
 }
 
-if [ $1 == "-a" ]; then
-	STACK_NAME=$2
-	shift 2
-fi
-
 subcommand=$1
 case $subcommand in
 	"" | "-h" | "--help")