If the summary is more than 255 characters while importing the XML results then it is throwing a wrong error

Description
If the summary is more than 255 characters while importing the XML results then it is throwing a wrong error.

Pre-conditions
The summary should be more than 255 characters in the XML results file.

How to reproduce

1. Create a Test Execution.
2. Import an XML file results(summary should be more than 255 characters) in the Test Execution.
3. Click on Import.

Actual result/Attachments

Throwing a java.lang.NullPointerException

Expected result:
It should throw an error "Summary must be less than 255 characters."
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Version

• 7.2.0-j9
• 7.1.1-j9
• 7.1.0-j9