fix: use underscore in place of unused error variable

dist/generate-custom-parser.js

@@ -1717,7 +1717,7 @@ function convertLazyLoadedImages($) {
           src = _JSON$parse.src;
 
       if (typeof src === 'string') return src;
-    } catch (e) {
+    } catch (_) {
       return false;
     }
 

dist/mercury.js

@@ -1546,7 +1546,7 @@ function convertLazyLoadedImages($) {
           src = _JSON$parse.src;
 
       if (typeof src === 'string') return src;
-    } catch (e) {
+    } catch (_) {
       return false;
     }
 

src/resource/utils/dom/convert-lazy-loaded-images.js

@@ -12,7 +12,7 @@ export default function convertLazyLoadedImages($) {
     try {
       const { src } = JSON.parse(str);
       if (typeof src === 'string') return src;
-    } catch (e) {
+    } catch (_) {
       return false;
     }