fix(*): handle empty srcsets, and jshint prefers === overall

Author: rjamet

src/ng/compile.js

@@ -1434,7 +1434,7 @@ function $CompileProvider($provide, $$sanitizeUriProvider) {
         // That works even dynamically, but it's not bypassable through the $sce.
         // Instead, if you want several unsafe URLs as-is, you should probably
         // use trustAsHtml on the whole tag.
-        if (nodeName === 'img' && key === 'srcset') {
+        if (nodeName === 'img' && key === 'srcset' && value) {
 
           // sanitize img[srcset] values
           var result = "";
@@ -2929,11 +2929,11 @@ function $CompileProvider($provide, $$sanitizeUriProvider) {
           (tag !== "img" && (attrNormalizedName === "src" ||
                             attrNormalizedName === "ngSrc"))) {
         return $sce.RESOURCE_URL;
-      } else if (tag == "img" && (attrNormalizedName == "src" ||
-                                  attrNormalizedName == "ngSrc") ||
-          tag == "a" && (attrNormalizedName == "href" ||
-                         attrNormalizedName == "xlinkHref" ||
-                         attrNormalizedName == "ngHref")) {
+      } else if (tag === "img" && (attrNormalizedName === "src" ||
+                                  attrNormalizedName === "ngSrc") ||
+          tag === "a" && (attrNormalizedName === "href" ||
+                         attrNormalizedName === "xlinkHref" ||
+                         attrNormalizedName === "ngHref")) {
         return $sce.URL;
       }
     }

src/ng/interpolate.js

@@ -138,7 +138,7 @@ function $InterpolateProvider() {
     }
 
     function isConcatenationAllowed(context) {
-        return context == $sce.URL;
+        return context === $sce.URL;
     }
 
     /**
@@ -307,7 +307,7 @@ function $InterpolateProvider() {
         }
       }
 
-      if (concat.length == 1 && expressionPositions.length == 1) {
+      if (concat.length === 1 && expressionPositions.length === 1) {
         singleExpression = true;
       }