Performance -> Calculation: Don't mix up "no quote" and "no capital gains"

[pfalcon]

There can be cases, when Performance -> Calculation -> Calculation tab doesn't include a security in either "Capital Gains" or "Realized Capital Gains". This can be when e.g. when there's no quotes configured for security. Then current price == buy price, CG is 0, and the current filters in the code filter it out. Suggestion: avoid this and maintain invariant that a security appears in either "Capital Gains" or "Realized Capital Gains", or both. The reason is obvious: if PP randomly (to a user) drops securities from reporting, then how this reporting can be trusted?

Of course, such a behavior (or filtering out zero gains) can be a feature. For example, if one has thousands of assets, majority of which never appreciate, then not seeing them in a report may be beneficial. But such a rare, improbable case should be handled differently, e.g. by adding an explicit "Filter out zero gains" checkbox to settings for the tab.