Check warnings produced by uglifyJS

[jaragunde]

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The minification process produces a list of warnings about our code, which could indicate potential bugs, dead code, etc. Some examples:

WARN: Non-strict equality against boolean: == true [tasks.js:703,12]
WARN: Side effects in initialization of unused variable taskPanel [tasks.js:1240,24]
WARN: Dropping unreachable code [ext-all-debug.js:37405,12]

Let's tackle these warnings one by one and fix them!