#11 QfDbObject QfTableData validation

[Vincent Vinet]

Currently, QfDbObject's refresh, submit, id, etc.. methods all call tableData() which returns a QfTableData*...
but what happens if the pointer or TableData is invalid?
We need some error management, because silent failure might lead to other problems (like creating bogus DB entries)

[Vincent Vinet]

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See QfExtSpatialPoint for a possible way to fix this, but as always changing QfDbObject involves a LOT of changing in the model