Fix crash after navToLocString in some cases #4535
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during office hours, saw an issue where there was a crash after a navToLocString
the code assumed that contentBlocks[0] was not undefined, but there may be situations where it is undefined for some amount of time (during loading or if bpPerPx/offsetPx is temporarily way off screen for example)
this code that causes the crash was introduced in v2.13.0 (recently)