ShaderPlug : Fix bug when getInput() == NULL.
#1849
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We were using `source()` without checking that an input existed. In the case of ArnoldDisplacement, this meant that when looking for the shader for `ArnoldDisplacement::mapPlug()`, it found the ArnoldDisplacement node itself, leading to an infinite loop.
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We were using
source()without checking that an input existed. In the case of ArnoldDisplacement, this meant that when looking for the shader forArnoldDisplacement::mapPlug(), it found the ArnoldDisplacement node itself, leading to an infinite loop.