Fix for issue 1976 - remove webgl warnings for empty lines when using gl-line3d #3174
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This PR resolves #1976 and cases where the line trace has segments less than one. This help avoid
throwing WebGL rendering warnings. Similar to PR #3171 (related to empty texts on gl-scatter3d) the conditions for checking array inputs are improved within the gl-line3d module.
@etpinard
@alexcjohnson