doc : update photo in the README file (#51)

* updated photo in the README

* removed unused imag

README.md

@@ -72,7 +72,7 @@ Reporting task to send provenance events considered as errors by email.
 
 #### Reporting Task Properties
 
-<img src="docs/images/email-reporting-task-configuration.png" width=600 />
+<img src="docs/images/email-reporting-task-properties.png" width=600 />
 
 * `Email Subject Prefix` is a property that contains a prefix to be added in the email subject. It can be for example the NiFi instance the error is coming from (optional).
 * `Specific Recipient Attribute Name` is a property that contains a flow file attribute name whose value will be used as an extra recipient email address when sending the email alert (optional).

nifi-provenance-reporting-tasks/src/main/java/io/egm/nifi/reporting/EmailProvenanceReporter.java

@@ -336,7 +336,7 @@ public void indexEvent(final Map<String, Object> event, final ReportingContext c
     public void sendErrorEmail(Map<String, Object> event, ReportingContext context) throws MessagingException {
         String emailSubject;
         if (context.getProperty(EMAIL_SUBJECT_PREFIX).getValue() != null) {
-            emailSubject = "[" + context.getProperty(EMAIL_SUBJECT_PREFIX).getValue() + "] : "
+            emailSubject = "[" + context.getProperty(EMAIL_SUBJECT_PREFIX).getValue() + "] "
                     + "Error occurred in processor " + event.get("component_name") + " "
                     + "in process group " + event.get("process_group_name");
         } else {