Crash reports handle invalid format strings properly

src/main/java/ru/windcorp/progressia/common/util/crash/CrashReports.java

@@ -43,6 +43,26 @@ public class CrashReports {
     public static void report(Throwable throwable, String messageFormat, Object... args) {
         StringBuilder output = new StringBuilder();
 
+        try {
+            String.format(messageFormat, args);
+        } catch (IllegalFormatException e) {
+            messageFormat = StringUtil.replaceAll(messageFormat, "%", "%%");
+
+            if (args.length != 0) {
+                messageFormat += "\nArgs:";
+                for (Object arg : args) {
+                    try {
+                        messageFormat += " \"" + arg.toString() + "\"";
+                    } catch (Throwable t) {
+                        messageFormat += " exc: \"" + t.getClass().toString() + "\"";
+                    }
+                }
+                args = new Object[0]; // clear args
+            }
+
+            messageFormat += "\nCould not format provided description";
+        }
+
         appendContextProviders(output);
         addSeparator(output);
         if (appendAnalyzers(output, throwable, messageFormat, args)) {