Use the first matched branch configuration

This change causes GitVersion to allow multiple branch configurations to
match the current branch, and instead of throwing an exception it will use
the first matching configuration that was found.

Author: cvpcs

src/GitVersionCore/BranchConfigurationCalculator.cs

@@ -25,7 +25,7 @@ public static KeyValuePair<string, BranchConfig> GetBranchConfiguration(Commit c
                 ConfigurationProvider.ApplyBranchDefaults(config, branchConfig, "");
                 return new KeyValuePair<string, BranchConfig>(string.Empty, branchConfig);
             }
-            if (matchingBranches.Length == 1)
+            else
             {
                 var keyValuePair = matchingBranches[0];
                 var branchConfiguration = keyValuePair.Value;
@@ -37,9 +37,6 @@ public static KeyValuePair<string, BranchConfig> GetBranchConfiguration(Commit c
 
                 return keyValuePair;
             }
-
-            const string format = "Multiple branch configurations match the current branch branchName of '{0}'. Matching configurations: '{1}'";
-            throw new Exception(string.Format(format, currentBranch.FriendlyName, string.Join(", ", matchingBranches.Select(b => b.Key))));
         }
 
         static KeyValuePair<string, BranchConfig>[] LookupBranchConfiguration([NotNull] Config config, [NotNull] Branch currentBranch)