Ensure that a domain is provided before removing

src/freedombone-app-blog

     if [[ $(app_is_installed blog) == "0" ]]; then
         return
     fi
+    if [ ${#FULLBLOG_DOMAIN_NAME} -eq 0 ]; then
+        return
+    fi
 
     if grep -q "FULLBLOG_DOMAIN_NAME" $CONFIGURATION_FILE; then
         FULLBLOG_DOMAIN_NAME=$(grep "FULLBLOG_DOMAIN_NAME" $CONFIGURATION_FILE | awk -F '=' '{print $2}')

src/freedombone-app-gnusocial

     if [[ $(app_is_installed gnusocial) == "0" ]]; then
         return
     fi
+    if [ ${#MICROBLOG_DOMAIN_NAME} -eq 0 ]; then
+        return
+    fi
     if grep -q "MICROBLOG_DOMAIN_NAME" $CONFIGURATION_FILE; then
         MICROBLOG_DOMAIN_NAME=$(grep "MICROBLOG_DOMAIN_NAME" $CONFIGURATION_FILE | head -n 1 | awk -F '=' '{print $2}')
     fi

src/freedombone-app-gogs

         return
     fi
 
+    if [ ${#GIT_DOMAIN_NAME} -eq 0 ]; then
+        return
+    fi
     systemctl stop gogs
     systemctl disable gogs
     nginx_dissite ${GIT_DOMAIN_NAME}

src/freedombone-app-hubzilla

     if [[ $(app_is_installed hubzilla) == "0" ]]; then
         return
     fi
+    if [ ${#HUBZILLA_DOMAIN_NAME} -eq 0 ]; then
+        return
+    fi
     echo $'Removing Hubzilla'
     nginx_dissite $HUBZILLA_DOMAIN_NAME
     if [ -d /var/www/$HUBZILLA_DOMAIN_NAME ]; then

src/freedombone-app-rss

     if [[ $(app_is_installed rss) == "0" ]]; then
         return
     fi
+    if [ ${#RSS_READER_DOMAIN_NAME} -eq 0 ]; then
+        return
+    fi
+
     nginx_dissite $RSS_READER_DOMAIN_NAME
     function_check remove_onion_service
     remove_onion_service ttrss ${RSS_READER_ONION_PORT} ${RSS_MOBILE_READER_ONION_PORT}

src/freedombone-app-wiki

     if [[ $(app_is_installed wiki) == "0" ]]; then
         return
     fi
-    if grep -q "WIKI_DOMAIN_NAME" $CONFIGURATION_FILE; then
-        WIKI_DOMAIN_NAME=$(grep "WIKI_DOMAIN_NAME" $CONFIGURATION_FILE | awk -F '=' '{print $2}')
+    if [ ${#WIKI_DOMAIN_NAME} -eq 0 ]; then
+        return
     fi
     function_check remove_onion_service
     remove_onion_service wiki ${WIKI_ONION_PORT}