[pgAdmin4][Rm#4246] Subnode control throws console error when used in Panels

[Murtuza Zabuawala]

Hi,

PFA minor patch to handle a case where Subnode control used in Panels.

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Regards,
Murtuza Zabuawala
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company

RM_4246.diff
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