Support removing a signer list (#1021)

* Make weights an optional field
* Fix #971

test/fixtures/requests/index.js

@@ -22,6 +22,7 @@ module.exports = {
   },
   prepareSettings: {
     domain: require('./prepare-settings'),
+    noSignerEntries: require('./prepare-settings-no-signer-entries'),
     signers: {
       normal: require('./prepare-settings-signers'),
       noThreshold: require('./prepare-settings-signers-no-threshold'),

test/fixtures/requests/prepare-settings-no-signer-entries.json

@@ -0,0 +1,5 @@
+{
+  "signers": {
+    "threshold": 0
+  }
+}

test/fixtures/responses/index.js

@@ -122,7 +122,9 @@ module.exports = {
     noInstructions: require('./prepare-settings-no-instructions.json'),
     signed: require('./prepare-settings-signed.json'),
     noMaxLedgerVersion: require('./prepare-settings-no-maxledgerversion.json'),
-    signers: require('./prepare-settings-signers.json')
+    signers: require('./prepare-settings-signers.json'),
+    noSignerList: require('./prepare-settings-no-signer-list.json'),
+    noWeights: require('./prepare-settings-no-weight.json')
   },
   prepareCheckCreate: {
     normal: require('./prepare-check-create'),

test/fixtures/responses/prepare-settings-no-signer-list.json

@@ -0,0 +1,8 @@
+{
+  "txJSON": "{\"TransactionType\":\"SignerListSet\",\"Account\":\"r9cZA1mLK5R5Am25ArfXFmqgNwjZgnfk59\",\"SignerQuorum\":0,\"Flags\":2147483648,\"LastLedgerSequence\":8820051,\"Fee\":\"24\",\"Sequence\":23}",
+  "instructions": {
+    "fee": "0.000024",
+    "sequence": 23,
+    "maxLedgerVersion": 8820051
+  }
+}

test/fixtures/responses/prepare-settings-no-weight.json

@@ -0,0 +1,8 @@
+{
+  "txJSON": "{\"TransactionType\":\"SignerListSet\",\"Account\":\"r9cZA1mLK5R5Am25ArfXFmqgNwjZgnfk59\",\"SignerQuorum\":2,\"SignerEntries\":[],\"Flags\":2147483648,\"LastLedgerSequence\":8820051,\"Fee\":\"24\",\"Sequence\":23}",
+  "instructions": {
+    "fee": "0.000024",
+    "sequence": 23,
+    "maxLedgerVersion": 8820051
+  }
+}