Remove bugged lossless image optim gain when there's a lossy one

front/src/views/rule.html

@@ -220,7 +220,7 @@
                     <p ng-if="!image.afterCompression">Current weight: {{image.original | bytes}}</p>
                     <p ng-if="image.afterCompression">Current weight: {{image.original | bytes}} ({{image.afterCompression | bytes}} gzipped)</p>
                     <p ng-if="image.lossless && image.afterOptimizationAndCompression">With a lossless optimization:<br/>{{image.afterOptimizationAndCompression | bytes}} gzipped (<b>-{{image.gain | bytes}}</b> gzipped)</p>
-                    <p ng-if="image.lossless && !image.afterOptimizationAndCompression">With a lossless optimization:<br/>{{image.lossless | bytes}} (<b>-{{image.gain | bytes}}</b>)</p>
+                    <p ng-if="image.lossless && !image.afterOptimizationAndCompression">With a lossless optimization:<br/>{{image.lossless | bytes}} <span ng-if="!image.lossy">(<b>-{{image.gain | bytes}}</b>)</span></p>
                     <p ng-if="image.lossy && image.afterOptimizationAndCompression">With a lossy optimization:<br/>{{image.afterOptimizationAndCompression | bytes}} gzipped (<b>-{{image.gain | bytes}} gzipped</b>)</p>
                     <p ng-if="image.lossy && !image.afterOptimizationAndCompression">With a lossy optimization:<br/>{{image.lossy | bytes}} (<b>-{{image.gain | bytes}}</b>)</p>
                 </div>