Cache policies LRU error (#590)

COLDBOX-1280 https://ortussolutions.atlassian.net/browse/COLDBOX-1280 #Resolve


* check if md keys exist before referencing
Fixes error:
Error sorting via store indexer Element TIMEOUT is undefined in MD. coldfusion.runtime.UndefinedElementException: Element
TIMEOUT is undefined in MD.

* Add default value if missing
Fixes error:
Error sorting via store indexer Invalid property requested: isSoftReference Valid properties are: coldfusion.runtime.CustomException:
Invalid property requested: isSoftReference

system/cache/policies/AbstractEvictionPolicy.cfc

@@ -83,6 +83,9 @@ component
 				continue;
 			}
 			var md = indexer.getObjectMetadata( item );
+			if ( NOT md.keyExists( "timeout" ) || NOT md.keyExists( "isExpired" ) ) {
+				continue;
+			}
 
 			// Evict if not already marked for eviction or an eternal object.
 			if ( md.timeout GT 0 AND NOT md.isExpired ) {

system/cache/store/ConcurrentSoftReferenceStore.cfc

@@ -189,7 +189,8 @@ component extends="coldbox.system.cache.store.ConcurrentStore" accessors=true {
 		if (
 			!isNull( local.softRef ) && variables.indexer.getObjectMetadataProperty(
 				arguments.objectKey,
-				"isSoftReference"
+				"isSoftReference",
+				false
 			)
 		) {
 			variables.softRefKeyMap.remove( softRef.hashCode() );