fnCheckConditions = function(aGrids) {
			var bValid = true;
			for (var i = 0; i < aGrids.length; i++) {
				var oGrid = aGrids[i];
				var bIsValid = that._checkCondition(oGrid, i === aGrids.length - 1);
				bValid = bValid && bIsValid;
			}

			return bValid;
		}
check if the entered/modified conditions are correct, marks invalid fields yellow (Warning state) and can be used to show error message dialog and give the
user the feedback that some values are wrong or missing.

@private
@returns {boolean} <code>True</code> if all conditions are valid, <code>false</code> otherwise.