Match node with not existed label

**Describe the bug**
A clear and concise description of what the bug is.

**How are you accessing AGE (Command line, driver, etc.)?**
- python driver
- pgcli with load 'age'

**What data setup do we need to do?**
```pgsql
None
```

**What is the command that caused the error?**
```pgsql
SELECT * from cypher('agegraph', $$ MATCH (node:NodeWithKey) RETURN node $$) as (v agtype);
```
```
SELECT * from cypher('agegraph', $$ MATCH (node:NodeWithKey) RETURN node $$) as (v agtype);
label NodeWithKey does not exists
LINE 1: SELECT * from cypher('agegraph', $$ MATCH (node:NodeWithKey)...
```

**Expected behavior**
return empty record

**Environment (please complete the following information):**
- Version: [e.g. 0.7.0]

**Additional context**
Add any other context about the problem here.