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/CKeyParent.java

@@ -0,0 +1,44 @@
+package misc.migration.v1_2;
+
+import javax.persistence.EmbeddedId;
+import javax.persistence.Entity;
+import javax.persistence.Table;
+import javax.persistence.Version;
+
+@Entity
+@Table(name = "migtest_ckey_parent")
+public class CKeyParent {
+
+  @EmbeddedId
+  CKeyParentId id;
+
+  String name;
+
+  @Version
+  int version;
+
+  public CKeyParentId getId() {
+    return id;
+  }
+
+  public void setId(CKeyParentId id) {
+    this.id = id;
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public void setName(String name) {
+    this.name = name;
+  }
+
+  public int getVersion() {
+    return version;
+  }
+
+  public void setVersion(int version) {
+    this.version = version;
+  }
+
+}