PWX-29069: Handling panic in case of incorrect volume template

[pp511]

Signed-off-by: Priyanshu Pandey ppandey@purestorage.com

What this PR does / why we need it:
Handling panic due to nil DiskProperties when no param is specified in -s

Which issue(s) this PR fixes (optional)
Closes #https://portworx.atlassian.net/browse/PWX-29069

Special notes for your reviewer:

• Issue is fixed after updating the volume template but we should handle this panic.
• This was caused when trying to dereference d.DiskProperties.DiskSizeGB

[codecov-commenter]

Codecov Report

Base: 8.10% // Head: 8.10% // No change to project coverage 👍

Coverage data is based on head (f9548d2) compared to base (d65a9e1).
Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@          Coverage Diff           @@
##           master    #131   +/-   ##
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  Coverage    8.10%   8.10%           
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  Files          18      18           
  Lines        4664    4664           
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  Hits          378     378           
  Misses       4264    4264           
  Partials       22      22           

Impacted Files	Coverage Δ
azure/azure.go	0.56% <0.00%> (ø)

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