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Fix warnings that can occur in the 1262 DB upgrade if any of the columns being changed to varchar contain NULL values. These warnings resulted in a DB upgrade failure for a at least one user, but in attempting to reproduce the failure (with Qt4.6.2+MySQL5.1, Qt4.6.2+MySQL5.5, Qt4.7.3+MySQL5.1, Qt4.8.0+MySQL5.1, and Qt4.8.0+MySQL5.5), I was unsuccessful. The only way I was able to cause it to fail was with MySQL strict mode enabled (sql_mode=STRICT_ALL_TABLES). Note that many other parts of MythTV are likely to fail with strict mode enabled, so it is recommended that users do not enable strict mode. Thanks to dchilton for reporting the issue, and to JK for helping to troubleshoot.
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