cli: Push coverage of AltVisitor to 90+%

alib2cli/CMakeLists.txt

alib2cli/src/grammar/AltCliLexer.g4

alib2cli/src/grammar/AltCliParser.g4

alib2cli/src/parser/AltVisitor.Arg.cpp

alib2cli/src/parser/AltVisitor.Command.cpp

alib2cli/src/parser/AltVisitor.cpp

alib2cli/src/parser/Parser.h

alib2cli/test-src/aql/AntlrParserTest.cpp

alib2cli/test-src/aql/aql.cpp.in

alib2cli/test-src/aql/basic/castStatement6.aql

alib2cli/test-src/aql/basic/execute7.aql

alib2cli/test-src/aql/basic/expression.aql

alib2cli/test-src/aql/basic/func6.aql

alib2cli/test-src/aql/basic/func7.aql

alib2cli/test-src/aql/basic/help.aql

alib2cli/test-src/aql/basic/introspect.aql

alib2cli/test-src/aql/basic/measurement1.aql

alib2cli/test-src/aql/basic/miscCommands.aql

alib2cli/test-src/aql/basic/proc2.aql

alib2cli/test-src/aql/basic/proc3.aql