updating getPrecision() to handle null/undefined/empty zoom params

query/suggest.js

@@ -6,16 +6,16 @@ function generate( params ){
 
   var getPrecision = function(zoom) {
     switch (true) {
-      case (zoom < 4):
+      case (zoom > 15):
-        return 1; // zoom: 1-3
+        return 5; // zoom: >= 16
-      case (zoom < 6):
+      case (zoom > 9):
-        return 2; // zoom: 4-5
-      case (zoom < 10):
-        return 3; // zoom: 6-9
-      case (zoom < 16):
         return 4; // zoom: 10-15
+      case (zoom > 5):
+        return 3; // zoom: 6-9
+      case (zoom > 3):
+        return 2; // zoom: 4-5
       default:
-        return 5; // zoom: >= 16
+        return 1; // zoom: 1-3 or when zoom: undefined
     }
   };
 

test/unit/query/suggest.js

@@ -59,7 +59,9 @@ module.exports.tests.precision = function(test, common) {
     {zoom:17, precision:5},
     {zoom:18, precision:5},
     {zoom:19, precision:5},
-    {zoom:20, precision:5}
+    {zoom:'', precision:1},
+    {zoom:null, precision:1},
+    {zoom:undefined, precision:1}
   ];
 
   test_cases.forEach( function( test_case ){