issues: 545407916

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id node_id number title user state locked assignee milestone comments created_at updated_at closed_at author_association pull_request body repo type active_lock_reason performed_via_github_app reactions draft state_reason
545407916 MDU6SXNzdWU1NDU0MDc5MTY= 73 upsert_all() throws issue when upserting to empty table 82988 closed 0     6 2020-01-05T11:58:57Z 2020-01-31T14:21:09Z 2020-01-05T17:20:18Z NONE  

If I try to add a list of dicts to an empty table using upsert_all, I get an error:

```python import sqlite3 from sqlite_utils import Database import pandas as pd

conx = sqlite3.connect(':memory') cx = conx.cursor() cx.executescript('CREATE TABLE "test" ("Col1" TEXT);')

q="SELECT * FROM test;" pd.read_sql(q, conx) #shows empty table

db = Database(conx) db['test'].upsert_all([{'Col1':'a'},{'Col1':'b'}])

TypeError Traceback (most recent call last) <ipython-input-74-8c26d93d7587> in <module> 1 db = Database(conx) ----> 2 db['test'].upsert_all([{'Col1':'a'},{'Col1':'b'}])

/usr/local/lib/python3.7/site-packages/sqlite_utils/db.py in upsert_all(self, records, pk, foreign_keys, column_order, not_null, defaults, batch_size, hash_id, alter, extracts) 1157 alter=alter, 1158 extracts=extracts, -> 1159 upsert=True, 1160 ) 1161

/usr/local/lib/python3.7/site-packages/sqlite_utils/db.py in insert_all(self, records, pk, foreign_keys, column_order, not_null, defaults, batch_size, hash_id, alter, ignore, replace, extracts, upsert) 1040 sql = "INSERT OR IGNORE INTO {table} VALUES({pk_placeholders});".format( 1041 table=self.name, -> 1042 pks=", ".join(["[{}]".format(p) for p in pks]), 1043 pk_placeholders=", ".join(["?" for p in pks]), 1044 )

TypeError: 'NoneType' object is not iterable

```

A hacky workaround in use is:

python try: db['test'].upsert_all([{'Col1':'a'},{'Col1':'b'}]) except: db['test'].insert_all([{'Col1':'a'},{'Col1':'b'}])

 140912432 issue     
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