[enh] #798 add errors in result of evaluate_condition

src/sakia/data/processors/transactions.py

src/sakia/gui/sub/transfer/controller.py

src/sakia/services/documents.py

src/sakia/services/sources.py

src/sakia/services/transactions.py

tests/unit/services/test_documents.py

tests/unit/services/test_sources.py