Handle lookup errors "silently" in `PartialEvaluator.hasBlendModes` (PR 11680 follow-up)
Handle lookup errors "silently" in `PartialEvaluator.hasBlendModes` (PR 11680 follow-up)

Given that this method is used during what's essentially a *pre*-parsing stage, before the actual OperatorList parsing occurs, on second thought it doesn't seem at all necessary to warn and trigger fallback in cases where there's lookup errors.

*Please note:* Any any errors will still be either suppressed or thrown, according to the `ignoreErrors` option, during the *actual* OperatorList parsing.

caremerge/pdf.js,macroplant/pdf.js,xavier114fch/pdf.js,Snuffleupagus/pdf.js,showpad/mozilla-pdf.js,caremerge/pdf.js,macroplant/pdf.js,mozilla/pdf.js,Snuffleupagus/pdf.js,macroplant/pdf.js,timvandermeij/pdf.js,showpad/mozilla-pdf.js,Shoobx/pdf.js,Shoobx/pdf.js,Shoobx/pdf.js,xavier114fch/pdf.js,mozilla/pdf.js,nawawi/pdf.js,nawawi/pdf.js,showpad/mozilla-pdf.js,Snuffleupagus/pdf.js,nawawi/pdf.js,mozilla/pdf.js,timvandermeij/pdf.js,timvandermeij/pdf.js