The assertion `stmt->Dbc->FirstStmt' failed in MonetDB Database Server v11.43.13.
**Describe the bug**
ODBC Driver assertion failed

**To Reproduce**
command to start odbc client:
```sh
apt install unixodbc
# config MonetDB in $HOME/.odbc.ini
...
isql monetdb -v
```

Input the following statements:
```sql
SELECT avg(42) over (order by row_number() over ());
SELECT 1;
```

It will end up with an assertion failure:
```
+---------------------------------------+
| Connected!                            |
|                                       |
| sql-statement                         |
| help [tablename]                      |
| quit                                  |
|                                       |
+---------------------------------------+
SQL> SELECT avg(42) over (order by row_number() over ())
[37000][MonetDB][ODBC Driver 11.44.0]unexpected end of file
[ISQL]ERROR: Could not SQLPrepare
SQL> SELECT 1
isql: /root/MonetDB/clients/odbc/driver/ODBCStmt.c:194: destroyODBCStmt: Assertion `stmt->Dbc->FirstStmt' failed.
fish: “isql monetdb -v” terminated by signal SIGABRT (Abort)
```

**Expected behavior**
```
+---------------------------------------+
| Connected!                            |
|                                       |
| sql-statement                         |
| help [tablename]                      |
| quit                                  |
|                                       |
+---------------------------------------+
SQL> SELECT avg(42) over (order by row_number() over ())
[37000][MonetDB][ODBC Driver 11.44.0]unexpected end of file
[ISQL]ERROR: Could not SQLPrepare
SQL> SELECT 1
+-----+
| %2  |
+-----+
| 1   |
+-----+
SQLRowCount returns 1
1 rows fetched
```

**Screenshots**
If applicable, add screenshots to help explain your problem.

**Software versions**
 - ODBC Driver version number: MonetDB ODBC Driver 11.44.0
 - OS and version: Ubuntu 20.04, UnixODBC 2.3.6
 -  - MonetDB Server version number (I think that the server version doesn't matter): MonetDB Database Server v11.43.13 (hg id: ce33b6b12cd6)

**Issue labeling **
Make liberal use of the labels to characterise the issue topics. e.g. identify severity, version, etc..

ODBC Driver Assertion `stmt->Dbc->FirstStmt' Failed 
This is a GitHub Issue
repo:MonetDB
owner:MonetDB
Title : ODBC Driver Assertion `stmt->Dbc->FirstStmt' Failed 
Issue date:

--- start body ---
**Describe the bug**
ODBC Driver assertion failed

**To Reproduce**
command to start odbc client:
```sh
apt install unixodbc
# config MonetDB in $HOME/.odbc.ini
...
isql monetdb -v
```

Input the following statements:
```sql
SELECT avg(42) over (order by row_number() over ());
SELECT 1;
```

It will end up with an assertion failure:
```
+---------------------------------------+
| Connected!                            |
|                                       |
| sql-statement                         |
| help [tablename]                      |
| quit                                  |
|                                       |
+---------------------------------------+
SQL> SELECT avg(42) over (order by row_number() over ())
[37000][MonetDB][ODBC Driver 11.44.0]unexpected end of file
[ISQL]ERROR: Could not SQLPrepare
SQL> SELECT 1
isql: /root/MonetDB/clients/odbc/driver/ODBCStmt.c:194: destroyODBCStmt: Assertion `stmt->Dbc->FirstStmt' failed.
fish: “isql monetdb -v” terminated by signal SIGABRT (Abort)
```

**Expected behavior**
```
+---------------------------------------+
| Connected!                            |
|                                       |
| sql-statement                         |
| help [tablename]                      |
| quit                                  |
|                                       |
+---------------------------------------+
SQL> SELECT avg(42) over (order by row_number() over ())
[37000][MonetDB][ODBC Driver 11.44.0]unexpected end of file
[ISQL]ERROR: Could not SQLPrepare
SQL> SELECT 1
+-----+
| %2  |
+-----+
| 1   |
+-----+
SQLRowCount returns 1
1 rows fetched
```

**Screenshots**
If applicable, add screenshots to help explain your problem.

**Software versions**
 - ODBC Driver version number: MonetDB ODBC Driver 11.44.0
 - OS and version: Ubuntu 20.04, UnixODBC 2.3.6
 -  - MonetDB Server version number (I think that the server version doesn't matter): MonetDB Database Server v11.43.13 (hg id: ce33b6b12cd6)

**Issue labeling **
Make liberal use of the labels to characterise the issue topics. e.g. identify severity, version, etc..

--- end body ---
