Null Reference Exception from QuantityTypeConverter

[WalkerCodeRanger]

Describe the bug
If the PropertyDescriptor property of the context which is invoking QuantityTypeConverter<T>.ConvertFrom() is null, it throws a NullReferenceException.

To Reproduce

var converter = new QuantityTypeConverter<Length>();
// TypeDescriptorContext with null `PropertyDescriptor` property
ITypeDescriptorContext context = new TypeDescriptorContext();
Length length = Length.FromMeters(1);

string convertedQuantity = (string)converter.ConvertTo(context, culture, length, typeof(string));

Expected behavior
No exception should be thrown. The conversion should be done as if there were a property with no attributes.

Additional context
In our codebase, this is happening indirectly through the System.Activities.Presentation.WorkflowDesigner.PropertyInspectorView. Also, the ITypeDescriptorContext.PropertyDescriptor docs explicitly state that this property "describes the given context item; otherwise, null if there is no PropertyDescriptor responsible for the call."

[angularsen]

Release UnitsNet/4.47.0 · angularsen/UnitsNet