Fix crash in ignoreElements

Was broken during client scripts refactoring

lib/browser/client-scripts/gemini.js

@@ -138,9 +138,7 @@
                 left: getScrollLeft()
             },
             captureArea: rect,
-            ignoreAreas: opts.ignoreSelectors.map(function(selector) {
-                return getElementCaptureRect(selector);
-            }),
+            ignoreAreas: findIgnoreAreas(opts.ignoreSelectors),
             viewportHeight: Math.round(viewportHeight),
             bodyHeight: Math.round(bodyHeight),
             coverage: coverage,
@@ -168,6 +166,17 @@
         return rect && rect.round();
     }
 
+    function findIgnoreAreas(selectors) {
+        var result = [];
+        each(selectors, function(selector) {
+            var element = document.querySelector(selector);
+            if (element) {
+                result.push(getElementCaptureRect(element).round());
+            }
+        });
+        return result;
+    }
+
     exports.getAbsoluteClientRect = function getAbsoluteClientRect(element) {
         var clientRect = new Rect(element.getBoundingClientRect());
         return clientRect.translate(getScrollLeft(), getScrollTop());