Werk #2337: Fixed problem with long hanging pnp graph rendering calls

Component	User interface
Title	Fixed problem with long hanging pnp graph rendering calls
Date	Jun 3, 2015
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.7i2 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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