only set style if required

Author: robbrazier

src/components/Icon.svelte

@@ -151,6 +151,9 @@
     }
     let size = normalisedScale();
     if (size === 1) {
+      if (combined.length === 0) {
+        return undefined;
+      }
       return combined;
     }
     if (combined !== "" && !combined.endsWith(';')) {

src/components/svg/Svg.svelte

@@ -4,7 +4,7 @@
   {x} {y} {width} {height}
   aria-label={label}
   role="{ label ? 'img' : 'presentation' }"
-  viewBox={box} style={style}
+  viewBox={box} {style}
   >
   <slot></slot>
 </svg>