`install` has an embedded SQL query trying to use %message

Embedded SQL uses the `%msg` variable and not the `%message` variable. The code should also initialize `%msg` before trying to use it.

The code as it stands:
```
ClassMethod Install(ByRef pCommandInfo) [ Internal ]
...
&sql(SELECT COUNT(*) into :count FROM %IPM_Repo.Definition WHERE Enabled = 1)
$$$ThrowSQLIfError(SQLCODE,%message)
```