Fix iops values when creating a compute offering (#3345)

@mike-tutkowski @syed If there's something more that needs to be added/changed, we'll just open another PR for this. 

For now this seems to be a very straightforward fix for the UI problem with managed storage.

* Fix iops values when creating a compute offering
* Fix iops values when creating a disk offering

Author: Philipp Bankonier

server/src/main/java/com/cloud/configuration/ConfigurationManagerImpl.java

@@ -2411,7 +2411,7 @@ protected ServiceOfferingVO createServiceOffering(final long userId, final boole
                 limitResourceUse, volatileVm, displayText, typedProvisioningType, localStorageRequired, false, tags, isSystem, vmType,
                 domainId, hostTag, deploymentPlanner);
 
-        if (Boolean.TRUE.equals(isCustomizedIops)) {
+        if (Boolean.TRUE.equals(isCustomizedIops) || isCustomizedIops == null) {
                 minIops = null;
                 maxIops = null;
         } else {
@@ -2632,7 +2632,7 @@ protected DiskOfferingVO createDiskOffering(final Long userId, final Long domain
             isCustomized = true;
         }
 
-        if (Boolean.TRUE.equals(isCustomizedIops)) {
+        if (Boolean.TRUE.equals(isCustomizedIops) || isCustomizedIops == null) {
             minIops = null;
             maxIops = null;
         } else {