Failed to set delayPattern with properties in redeliveryPolicy tag.

Issue

• User defined a redelivery policy in <onException> with

<redeliveryPolicy maximumRedeliveries="{\{maxRe}}" delayPattern="{\{delayPatt}}" />

• With properties max=-1 and pattern=0:10000;6:300000;18:900000
• But user get the following error

Caused by: java.lang.NumberFormatException: null
  at java.lang.Long.parseLong(Long.java:404)[:1.7.0_45]
  at java.lang.Long.valueOf(Long.java:540)[:1.7.0_45]
  at org.apache.camel.processor.RedeliveryPolicy.calculateRedeliverDelayUsingPattern(RedeliveryPolicy.java:242)[org.apache.camel:camel-core:2.12.0.redhat-610379 com.googlecode.concurrentlinkedhashmap:concurrentlinkedhashmap-lru:1.4]
  at org.apache.camel.processor.RedeliveryPolicy.calculateRedeliveryDelay(RedeliveryPolicy.java:201)[org.apache.camel:camel-core:2.12.0.redhat-610379 com.googlecode.concurrentlinkedhashmap:concurrentlinkedhashmap-lru:1.4]