Test for error

src/freedombone-controlpanel-user

@@ -702,12 +702,12 @@ function sign_gpg_key {
 			if [ ${#SIGN_ADDRESS} -gt 2 ]; then
 				clear
 				fpr=$(gpg --with-colons --fingerprint "$SIGN_ADDRESS" | grep fpr | head -n 1 | awk -F ':' '{print $10}')
-				if [[ $fpr == *"error"* ]]; then
+				if [ ! "$?" = "0" ]; then
 					gpg --search "$SIGN_ADDRESS"
 					fpr=$(gpg --with-colons --fingerprint "$SIGN_ADDRESS" | grep fpr | head -n 1 | awk -F ':' '{print $10}')
 				fi
 
-				if [[ $fpr != *"error"* ]]; then
+				if [ ! "$?" = "0" ]; then
 					if [ ${#fpr} -gt 2 ]; then
 						gpg --sign-key $fpr
 						if [ "$?" = "0" ]; then