Github user rafaelweingartner commented on a diff in the pull request:

    https://github.com/apache/cloudstack/pull/1878#discussion_r105677642
  
    --- Diff: 
plugins/hypervisors/vmware/src/com/cloud/hypervisor/vmware/resource/VmwareResource.java
 ---
    @@ -2072,6 +2121,17 @@ protected StartAnswer execute(StartCommand cmd) {
         }
     
         /**
    +     * Update boot args with the new nic mac addresses.
    +     */
    +    protected String replaceNicsMacSequenceInBootArgs(String 
oldMacSequence, String newMacSequence, VirtualMachineTO vmSpec) {
    +        String bootArgs = vmSpec.getBootArgs();
    +        if (!StringUtils.isEmpty(bootArgs) && 
!StringUtils.isEmpty(oldMacSequence) && !StringUtils.isEmpty(newMacSequence)) {
    +            return bootArgs.replace(oldMacSequence, newMacSequence);
    +        }
    +        return "";
    --- End diff --
    
    Is this case possible? `bootArgs` not empty and `oldMacSequence` or 
`newMacSequence` empty
    
    If so, would not it be better to return at line 2131 the variable 
`bootArgs`?


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