API: List of empty viewpoints for bulk delete (#6).

lists/empty.js

@@ -0,0 +1,13 @@
+function() {
+  provides('json', function() {
+    var docs = [];
+    while (r = getRow()) {
+      docs.push({
+        _id: r.doc._id,
+        _rev: r.doc._rev,
+        _deleted: true
+      });
+    }
+    send(JSON.stringify({docs: docs}));
+  });
+}

rewrites.json

@@ -8,6 +8,12 @@
     "query": {
       "key": [":resource"]
     }
+  }, {
+    "from": "empty",
+    "to": "_list/empty/empty",
+    "query": {
+      "include_docs": "true"
+    }
   }, {
     "from": "", 
     "to": "../../",

views/empty/map.js

@@ -0,0 +1,5 @@
+function(o) {
+  if (o.viewpoint_name && !o.topics) {
+    emit();
+  }
+}