Fixed issue #557: Warning Indicator increments when opening blocks drawer
Fixed issue #557: Warning Indicator increments when opening blocks drawer

In Blockly.WarningHandler.checkErrors, added special case to ignore blocks
in a flyout. Otherwise, blocks in drawer having connected subblocks
(see Blockly.Drawer.defaultBlockXMLStrings) will increment warning indicator.

Change-Id: I10e04f2929f6f280af685cf9d3764c25dd0c0388

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