[2021.2][ShaderGraph] Fixing Gradient node divide by zero warnings #4248
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Purpose of this PR
Using the sample gradient node results in divide by zero warnings.
This PR fixes the warnings by properly looping over only the active keys.
Testing status
Tested gradient node with 2, 3, 5, 8 keys, checked generated code, visual result and shader warnings.
Yamato:
ShaderGraph PR Job: 🟢
https://yamato.cds.internal.unity3d.com/jobs/902-Graphics/tree/sg%252Ffix-gradient-warnings/.yamato%252Fall-shadergraph.yml%2523PR_ShaderGraph_trunk/6472993/job/pipeline
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