Add JSON-LD keyword to sample _else test data

See #343

Author: fsteeg

metamorph/src/test/java/org/metafacture/metamorph/TestMetamorphBasics.java

@@ -106,6 +106,7 @@ private void testElseData(final String elseKeyword) {
                 "</rules>",
                 i -> {
                     i.startRecord("1");
+                    i.literal("@id", "123");
                     i.literal("Shikotan", "Aekap");
                     i.startEntity("Germany");
                     i.literal("Langeoog", "Moin");
@@ -119,6 +120,7 @@ private void testElseData(final String elseKeyword) {
                 },
                 o -> {
                     o.get().startRecord("1");
+                    o.get().literal("@id", "123");
                     o.get().literal("Shikotan", "Aekap");
                     o.get().literal("Germany.Langeoog", "Moin");
                     o.get().startEntity("Germany");