Merge pull request #2156 from odomu/master

修复购买操作脚本执行问题

app/src/main/java/io/legado/app/ui/book/read/ReadBookActivity.kt

@@ -972,15 +972,19 @@ class ReadBookActivity : BaseReadBookActivity(),
                 throw NoStackTraceException("no pay action")
             }
             JsUtils.evalJs(payAction) {
+                it["java"] = source
+                it["source"] = source
                 it["book"] = book
                 it["chapter"] = chapter
             }
         }.onSuccess {
+            if (it.isNotBlank()) {
                 startActivity<WebViewActivity> {
                     putExtra("title", getString(R.string.chapter_pay))
                     putExtra("url", it)
                     IntentData.put(it, ReadBook.bookSource?.getHeaderMap(true))
                 }
+            }
         }.onError {
             toastOnUi(it.localizedMessage)
         }