handle memory issue

[YangSen-qn]

No description provided.

[codecov]

Codecov Report

Merging #429 into master will increase coverage by 0.01%.
The diff coverage is 85.71%.

@@             Coverage Diff              @@
##             master     #429      +/-   ##
============================================
+ Coverage     72.63%   72.64%   +0.01%     
+ Complexity      855      853       -2     
============================================
  Files            73       73              
  Lines          4538     4537       -1     
  Branches        672      671       -1     
============================================
  Hits           3296     3296              
+ Misses          817      816       -1     
  Partials        425      425              

Impacted Files	Coverage Δ	Complexity Δ
.../com/qiniu/android/collect/UploadInfoReporter.java	67.74% <0.00%> (-1.62%)	28.00 <0.00> (-1.00)
...droid/http/metrics/UploadRegionRequestMetrics.java	80.64% <ø> (ø)	10.00 <0.00> (ø)
.../qiniu/android/http/metrics/UploadTaskMetrics.java	83.72% <ø> (ø)	13.00 <0.00> (ø)
.../java/com/qiniu/android/storage/UploadOptions.java	63.41% <ø> (-0.88%)	10.00 <0.00> (ø)
.../java/com/qiniu/android/storage/UploadManager.java	81.75% <75.00%> (+2.98%)	33.00 <2.00> (ø)
.../qiniu/android/http/request/HttpSingleRequest.java	80.61% <85.71%> (-1.39%)	9.00 <4.00> (ø)
...roid/http/request/httpclient/SystemHttpClient.java	75.77% <88.00%> (+0.65%)	21.00 <7.00> (-1.00)	⬆️
...droid/http/metrics/UploadSingleRequestMetrics.java	93.75% <100.00%> (+0.41%)	17.00 <4.00> (+1.00)
...iniu/android/http/request/httpclient/ByteBody.java	100.00% <100.00%> (ø)	6.00 <1.00> (+1.00)
...ain/java/com/qiniu/android/storage/BaseUpload.java	77.45% <100.00%> (+0.22%)	23.00 <0.00> (ø)
... and 3 more

[e06084]

建议可以在最开始判断request 是否是 null，如果是，直接返回