Don't throw an exception in StructureNode::isDefined() when checking an extension field, even if extension is unregistered #333
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…an extension field, even if extension is unregistered Before this change: • isDefined( "foo" ) returns true OR false • isDefined( "nor:normalX" ) returns true OR false (if the extension is registered) OR causes an exception (if the extension is unregistered) This is counterintuitive, so get rid of the exception case and just return false even if the extension is unregistered. Fixes #330
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Before this change:
• isDefined( "foo" ) returns true OR false
• isDefined( "nor:normalX" ) returns true OR false (if the extension is registered) OR causes an exception (if the extension is unregistered)
This is counterintuitive, so get rid of the exception case and just return false even if the extension is unregistered.
Fixes #330