Fix IndexOutOfBoundsException with offset (#1273)

Pagination logic was being performed when offset == total, instead an empty list should be returned.

Author: matthew-long

grails-datastore-gorm-test/src/main/groovy/org/grails/datastore/mapping/simple/query/SimpleMapQuery.groovy

@@ -162,7 +162,7 @@ class SimpleMapQuery extends Query {
 
     private List applyMaxAndOffset(List sortedResults) {
         final def total = sortedResults.size()
-        if (offset > total) return Collections.emptyList()
+        if (offset >= total) return Collections.emptyList()
 
         // 0..3
         // 0..-1