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Prevent generation of invalid negative border-radius values

Closed Administrator requested to merge panel-border-radius into master

Created by: ghost

When @border-radius-base equals 0 compiled css is invalid:

.popover-title {
  padding: 8px 14px;
  margin: 0;
  font-size: 14px;
  background-color: #f7f7f7;
  border-bottom: 1px solid #ebebeb;
  border-radius: -1px -1px 0 0;
}
.panel-heading {
  padding: 10px 15px;
  border-bottom: 1px solid transparent;
  border-top-right-radius: -1;
  border-top-left-radius: -1;
}

In border-radius negative values are now allowed. See https://developer.mozilla.org/en-US/docs/Web/CSS/border-radius#Values_2

Use http://lesscss.org/functions/#math-functions-max to avoid this