Add logic to prevent hard errors when running shell commands.

deployments/zncServer/znc.yml

@@ -12,11 +12,19 @@
       when: result is failed
     - name: build from latest version
       shell: cd ~/znc-docker/full && docker build -t znc -f Dockerfile .
-    - name: Check if there are any existing mojo containers running and kill it
+    - name: Check if there are any existing ZNC containers running and kill it
+      shell: docker ps | grep 'znc' | awk '{print $1}'
+      register: result
+    - name: if there are running containers, remove them
       shell: docker ps | grep 'znc' | awk '{print $1}' | xargs docker kill
-    - name: Remove any existing containers using the znc name, its mine and i must have it
+      when: result.stdout != ""
+    - name: discover if any containers with ZNC in name
       # this has to be a shell because command: isn't interactive
+      shell: docker container ls | grep 'znc'
+      register: result
+    - name: remove any existing containers with ZNC in name
       shell: docker container rm znc
+      when: result.stdout != ""
     - name: run the container (assumes the volume is already set up)
       command: docker run -d -p 5000:5000 -v znc-cfg:/znc-data znc