FIX: Splitcolumns must return an empty array if string was empty (#1315)

* Add test suite from rpraml

* FIX: Splitcolumns must return an empty array if string was empty

* Just the reference scripts

src/test/java/misc/migration/v1_2/ERef.java

@@ -6,6 +6,10 @@ import javax.persistence.Entity;
 import javax.persistence.Id;
 import javax.persistence.OneToMany;
 import javax.persistence.Table;
+import javax.validation.constraints.Size;
+
+import io.ebean.annotation.Index;
+import io.ebean.annotation.NotNull;
 
 @Entity
 @Table(name = "migtest_e_ref")
@@ -16,4 +20,9 @@ public class ERef {
   
   @OneToMany
   List<EBasic> basics;
+
+  @NotNull
+  @Index(unique = true)
+  @Size(max=127)
+  String name;
 }