title: How to suppress zeroes when using geom_histogram with scale_y_log10
body: <p>I'm trying to plot a histogram with a log y scale using ggplot, geom_histogram and scale_y_log10. Most regions (those with counts greater than 1) appear correct: the background is transparent and the histogram bars are filled with the default color black.  But at counts of 1, the colors are inverted:  black background and transparent fill of the histogram bars.  This code (below) generates the example in the graph.</p>
  
  <p>Can anyone explain the cause of this?  I understand the problems that come with log scales but I can't seem to find a solution to this.  I'm hoping there's a easy fix, or that I overlooked something.</p>
  
  <pre><code>set.seed(1)
  df &lt;- data.frame(E=sample(runif(100), 20, TRUE))
  ggplot(df,aes(E)) + geom_histogram(binwidth=0.1) + scale_y_log10(limits=c(0.1,100)) + xlim(0,1)
  </code></pre>
  
  <p><img src="https://i.stack.imgur.com/SRdML.png" alt="Example of reversed color scheme below the count of 1"></p>