[VSPC-199] Fixed the link issue with null targetSpace

[pradeep-017]

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Please confirm the following by adding an x for each item (turn [ ] into [x]).

• I have removed all code style changes that are not necessary (e.g. changing blanks across the whole file that don’t need to be changed, adding empty lines in parts other than your own code)
• I am not making any changes to files that don’t have any effect (e.g. imports added that don’t need to be added)
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Please provide a brief description of your ticket

Links don't load on space staff page - When a linked space is deleted, the staff site crashes while showing the links over space.

Anything else the reviewer needs to know?

... describe here ...

[diging-jenkins]

Can one of the admins verify this patch?

[jdamerow]

Make it so, Jenkins.

[jdamerow]

Make it so, Jenkins.

[jdamerow]

Make it so, Jenkins.