Fixed cas cov parsing

Author: Dom Laetsch

lib/BtCore.py

@@ -300,7 +300,7 @@ def parseCovs(self, covLibObjs):
                 for name, cov in cov_dict.items():
                     covLib.cov_sum += cov
                     self.dict_of_blobs[name].addCov(covLib.name, cov)
-                    self.dict_of_blobs[name].read_cov = {covLib.name : read_cov_dict[name]}
+                    self.dict_of_blobs[name].addReadCov(covLib.name, read_cov_dict[name])
 
             elif covLib.fmt == 'cov':
                 cov_dict = BtIO.readCov(covLib.f, set(self.dict_of_blobs))

lib/BtPlot.py

@@ -324,7 +324,8 @@ def compute_stats(self):
             for cov_lib in self.cov_libs:
                 stats[label]['cov_mean'][cov_lib] = mean(array(stats[label]['covs'][cov_lib])) if stats[label]['count_visible'] > 0 else 0.0
                 stats[label]['cov_std'][cov_lib] = std(array(stats[label]['covs'][cov_lib])) if stats[label]['count_visible'] > 0 else 0.0
-                stats[label]['reads_mapped_perc'][cov_lib] = stats[label]['reads_mapped'][cov_lib]/self.cov_libs_total_reads_dict[cov_lib]
+                if self.cov_libs_total_reads_dict[cov_lib]:
+                    stats[label]['reads_mapped_perc'][cov_lib] = stats[label]['reads_mapped'][cov_lib]/self.cov_libs_total_reads_dict[cov_lib]
 
         self.stats = stats