Subscribers to Chart of the Week received this commentary on Sunday, April 21.There aren’t many constants on Wall Street, but one is bank stocks paving the way for the new cycle of quarterly reports. They always offer investors a sneak peek of what to expect each earnings season. One of the first to enter the ring is usually Charles Schwab (SCWH), which took a haircut back in January on the back of a disappointing fourth quarter whiff. This time around, the banking giant’s first-quarter earnings and revenue ...