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Fix panic from indenting on tree with errors
`deepest_preceding` is known to be a descendant of `node`. Repeated calls of `Node::parent` _should_ eventually turn `deepest_preceding` into `node`, but when the node is errored (the tree contains a syntax error), `Node::parent` returns None. In the typescript case: if(true) &&true // ^ press enter here The tree is: (program [0, 0] - [1, 0] (if_statement [0, 0] - [0, 15] condition: (parenthesized_expression [0, 2] - [0, 8] (true [0, 3] - [0, 7])) consequence: (expression_statement [0, 8] - [0, 15] (binary_expression [0, 8] - [0, 15] left: (identifier [0, 8] - [0, 8]) right: (true [0, 11] - [0, 15]))))) `node` is the `program` node and `deepest_preceding` is the `binary_expression`. The tree is errored on the `binary_expression` node with `(MISSING identifier [0, 8] - [0, 8])`. In the C++ case: ; << // press enter after the ';' The tree is: (translation_unit [0, 0] - [1, 0] (expression_statement [0, 0] - [0, 1]) (ERROR [0, 1] - [0, 4] (identifier [0, 1] - [0, 1]))) `node` is the `translation_unit` and `deepest_preceding` is the `ERROR` node. In both cases, `Node::parent` on the errored node returns None.
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