Add nil check in databricks plugin

[pingsutw]

TL;DR

Add nil check in databricks plugin. should fix https://flyte-org.slack.com/archives/CP2HDHKE1/p1678980405562029?thread_ts=1678831311.261609&cid=CP2HDHKE1

Type

• Bug Fix
• Feature
• Plugin

Are all requirements met?

• Code completed
• Smoke tested
• Unit tests added
• Code documentation added
• Any pending items have an associated Issue

Complete description

^^^

Tracking Issue

^^^

Follow-up issue

NA

[codecov]

Codecov Report

Merging #332 (0f60d03) into master (18a594e) will increase coverage by 1.31%.
The diff coverage is 0.00%.

❗ Current head 0f60d03 differs from pull request most recent head c79ed62. Consider uploading reports for the commit c79ed62 to get more accurate results

@@            Coverage Diff             @@
##           master     #332      +/-   ##
==========================================
+ Coverage   62.65%   63.97%   +1.31%     
==========================================
  Files         146      146              
  Lines       12220     9904    -2316     
==========================================
- Hits         7657     6336    -1321     
+ Misses       3981     2985     -996     
- Partials      582      583       +1     

Flag	Coverage Δ
unittests	?

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Impacted Files	Coverage Δ
go/tasks/plugins/webapi/databricks/plugin.go	65.65% <0.00%> (+3.52%)	⬆️

... and 129 files with indirect coverage changes

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