fix read data empty and then exception

[YangSen-qn]

No description provided.

[codecov]

Codecov Report

Merging #483 (f529277) into master (890acf5) will decrease coverage by 1.08%.
The diff coverage is 60.22%.

❗ Current head f529277 differs from pull request most recent head 00fb178. Consider uploading reports for the commit 00fb178 to get more accurate results

@@             Coverage Diff              @@
##             master     #483      +/-   ##
============================================
- Coverage     70.36%   69.28%   -1.09%     
- Complexity     1190     1344     +154     
============================================
  Files            95      104       +9     
  Lines          6199     6967     +768     
  Branches        925     1046     +121     
============================================
+ Hits           4362     4827     +465     
- Misses         1197     1372     +175     
- Partials        640      768     +128     

Impacted Files	Coverage Δ
...ain/java/com/qiniu/android/collect/ReportItem.java	81.81% <ø> (+4.54%)	⬆️
.../main/java/com/qiniu/android/common/Constants.java	0.00% <ø> (ø)
.../main/java/com/qiniu/android/common/FixedZone.java	54.00% <0.00%> (ø)
...ain/java/com/qiniu/android/http/dns/DnsSource.java	0.00% <0.00%> (ø)
.../qiniu/android/http/request/UploadRequestInfo.java	100.00% <ø> (ø)
.../qiniu/android/storage/PartsUploadPerformerV1.java	81.81% <0.00%> (-3.73%)	⬇️
...n/java/com/qiniu/android/storage/UploadInfoV1.java	70.85% <0.00%> (+0.57%)	⬆️
...n/java/com/qiniu/android/utils/AndroidNetwork.java	44.64% <ø> (ø)
...main/java/com/qiniu/android/http/dns/HappyDns.java	26.31% <11.76%> (-55.51%)	⬇️
...main/java/com/qiniu/android/http/ResponseInfo.java	61.44% <16.66%> (+1.68%)	⬆️
... and 68 more