fix nullpointer

JemyCheung · JemyCheung · commit e5b197508b4f · 2020-05-09T14:45:42.000+08:00
diff --git a/library/src/androidTest/java/com/qiniu/android/DnsApiTest.java b/library/src/androidTest/java/com/qiniu/android/DnsApiTest.java
@@ -108,6 +108,7 @@ public void testRecoverCache() {
             recorder = new DnsCacheFile(Config.dnscacheDir);
         } catch (IOException e) {
             e.printStackTrace();
+            return;
         }
         String fileName = recorder.getFileName();
         if (fileName == null) {

Original file line number	Diff line number	Diff line change
`@@ -108,6 +108,7 @@ public void testRecoverCache() {`
`108`	`108`	`recorder = new DnsCacheFile(Config.dnscacheDir);`
`109`	`109`	`} catch (IOException e) {`
`110`	`110`	`e.printStackTrace();`
	`111`	`+ return;`
`111`	`112`	`}`
`112`	`113`	`String fileName = recorder.getFileName();`
`113`	`114`	`if (fileName == null) {`