Fix: avoid refering a SincedbValue when it's not present in SincedbCollection #273
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If the value of the setting
sincedb_clean_after
is too short (1 ms) it happens that during the content reading loop (in read mode) the loops itself trigger the cleanup of the same value from the SincedbCollection and then italso try to access it again creating an error.
This commit resolves the problem guarding against the presence in the sincebd_collection before accessing it.
Fixes: #272