fix: crash when old table class removed from nut::database [skip ci]

src/generators/sqlgeneratorbase.cpp

@@ -186,6 +186,9 @@ QString SqlGeneratorBase::diff(FieldModel *oldField, FieldModel *newField)
 
 QStringList SqlGeneratorBase::diff(TableModel *oldTable, TableModel *newTable)
 {
+    if (!newTable && !oldTable)
+        return QStringList();
+
     if (oldTable && newTable)
         if (*oldTable == *newTable)
             return QStringList();

src/phrases/assignmentphraselist.cpp

@@ -20,7 +20,7 @@
 
 #include "assignmentphraselist.h"
 #include "phrasedata.h"
-#include <phrase.h>
+#include "assignmentphrase.h"
 
 NUT_BEGIN_NAMESPACE