server: Allow storing empty addresses on transaction inputs/outputs

server/app/com/xsn/explorer/data/anorm/dao/TransactionInputPostgresDAO.scala

@@ -35,7 +35,7 @@ class TransactionInputPostgresDAO {
             |INSERT INTO transaction_inputs
             |  (txid, index, from_txid, from_output_index, value, addresses)
             |VALUES
-            |  ({txid}, {index}, {from_txid}, {from_output_index}, {value}, ARRAY[{addresses}])
+            |  ({txid}, {index}, {from_txid}, {from_output_index}, {value}, ARRAY[{addresses}]::TEXT[])
           """.stripMargin,
           params.head,
           params.tail: _*

server/app/com/xsn/explorer/data/anorm/dao/TransactionOutputPostgresDAO.scala

@@ -61,7 +61,7 @@ class TransactionOutputPostgresDAO {
             |INSERT INTO transaction_outputs
             |  (txid, index, value, addresses, hex_script)
             |VALUES
-            |  ({txid}, {index}, {value}, ARRAY[{addresses}], {hex_script})
+            |  ({txid}, {index}, {value}, ARRAY[{addresses}]::TEXT[], {hex_script})
           """.stripMargin,
           params.head,
           params.tail: _*

server/test/com/xsn/explorer/data/TransactionPostgresDataHandlerSpec.scala

@@ -52,6 +52,19 @@ class TransactionPostgresDataHandlerSpec extends PostgresDataHandlerSpec with Be
       result mustEqual Good(expected)
     }
 
+    "find no results - no address involved" in {
+      val tx = transaction.copy(
+        inputs = transaction.inputs.map(_.copy(addresses = List.empty)),
+        outputs = transaction.outputs.map(_.copy(addresses = List.empty))
+      )
+      upsertTransaction(tx)
+
+      val expected = PaginatedResult(query.offset, query.limit, Count(0), List.empty)
+      val result = dataHandler.getBy(randomAddress, query, defaultOrdering)
+
+      result mustEqual Good(expected)
+    }
+
     "find the right values" in {
       upsertTransaction(transaction)